Heat and volatized salt recovery from reaction effluent

Claim 2

A process for recovering vaporized salt from a gaseous reaction effluent withdrawn from a reaction system employing the salt while simultaneously recovering heat from the reaction effluent, comprising: contacting the gaseous reaction effluent with solid particles by suspending the solid particles in flowing gaseous reaction effluent to provide dilute phase transport contact, said solid particles being at a temperature at which vaporized salt condenses from the gas onto the solid particles, said solid particles being heated and said gaseous reaction effluent being cooled by said contact; separating gaseous reaction effluent from the solid particles; cooling separated solid particles in a fluidized bed, said fluidized bed being fluidized by a fluidizing gas, said particles being cooled in the fluidized bed to a temperature at which vaporized salt condenses onto the solid particles; employing cooled solid particles for contacting the gaseous reaction effluent; and recovering and recycling to the reaction system solid salt fines attrited from the solid particles and present in the fluidizing and reaction effluent gases, said solid salt fines being attrited in equilibrium with the condensation of vaporized salt onto the solid particles.

Claim 3

The process of claim 1 wherein the fluidizing gas is a feed gas to the reaction system and solid salt fines are recovered and recycled to the reaction system in the fluidizing gas.

Claim 4

The process of claim 1 wherein the salt is employed in the reaction system in molten form.

Claim 5

The process of claim 1 wherein the solid particles are cooled in the fluidized bed by indirect heat transfer.

Claim 6

The process of claim 1 wherein the effluent gas from the reaction system is essentially free of water.

Claim 7

The process of claim 1 wherein solid salt fines are recovered from the fluidizing and reaction effluent gases by filtration.

Claim 8

A process for recovering heat from a reaction effluent containing a volatized salt, comprising: withdrawing from a reaction system an effluent containing vaporized salt; contacting the effluent with solid particles in a dilute phase transport contact zone, said solid particles being at a temperature at which vaporized salt condenses from the gas onto the solid particles, said solid particles cooling the effluent gas; separating the solid particles containing condensed salt from the effluent gas; further cooling the effluent gas by indirect heat transfer to recover further heat therefrom; introducing separated solid particles containing condensed salt into a cooling zone wherein the particles are maintained as a fluidized bed by at least a portion of a feed gas to the reaction system, said fluidizing gas being heated by the particles and partially cooling the particles, with solid salt fines being attrited from the particles by the feed gas, said particles also being cooled in the fluidized bed by indirect heat transfer to recover heat from the solid particles; employing cooled solid particles for contacting the effluent gas; and passing heated feed gas, containing attrited salt fines, from the cooling zone to the reaction system.

Claim 9

A process for recovering heat from a reaction effluent containing a volatized salt, comprising: withdrawing from a reaction system an effluent containing vaporized salt; contacting the effluent with solid particles in a dilute phase transport contact zone, said solid particles being at a temperature at which vaporized salt condenses from the gas onto the solid particles, said solid particles cooling the effluent gas; separating the solid particles containing condensed salt from the effluent gas; further cooling the effluent gas by indirect heat transfer to recover further heat therefrom; introducing separated solid particles containing condensed salt into a cooling zone wherein the particles are maintained as a fluidized bed by at least a portion of a feed gas to the reaction system, said fluidizing gas being heated by the particles and partially cooling the particles, with solid salt fines being attrited from the particles by the feed gas, said particles also being cooled in the fluidized bed by indirect heat transfer to recover heat from the solid particles; employing cooled solid particles for contacting the effluent gas; and passing heated feed gas, containing attrited salt fines, from the cooling zone to the reaction system.

Claim 10

The process of claim 7 wherein the fluidized bed of particles is cooled by indirect heat transfer with water to generate steam.

Claim 11

The process of claim 8 wherein the further cooled effluent gas includes attrited salt fines which are recovered therefrom and recycled to the reaction system.

Claim 12

The process of claim 9 wherein the effluent gas includes water vapor and the further cooling of the gas is to a temperature which is above the dew point of water in the effluent gas.

Claim 13

The process of claim 10 wherein the effluent gas is further cooled by indirect heat transfer with water to produce steam.

Claim 14

The process of claim 10 wherein volatized salt is derived from molten salt employed in the reaction system.

Claim 15

The process of claim 7 wherein solid salt fines are attrited from the solid particles by the fluidizing gas and the effluent gas in equilibrium with salt condensation onto the solid particles.

Claim 16

In a system for producing a chlorinated hydrocarbon wherein a molten salt containing the higher and lower valent chlorides of a multivalent metal is oxidized in a first reaction zone and molten salt from the first reaction zone is employed in a second reaction zone for producing chlorinated hydrocarbon, and wherein effluent gas withdrawn from the second reaction zone includes volatized salt, the improvement for recovering heat from the effluent gas, comprising: contacting the effluent gas with solid particles in a dilute phase transport contact zone, said solid particles being at a temperature at which vaporized salt condenses from the gas onto the solid particles, said solid particles cooling the effluent gas; separating the solid particles containing condensed salt from the effluent gas; further cooling the effluent gas by indirect heat transfer to recover further heat therefrom; introducing separated solid particles containing condensed salt into a cooling zone wherein the particles are maintained as a fluidized bed by at least a portion of a feed gas to one of the first and second reaction zones, said fluidizing gas being heated by the particles and partially cooling the particles, with solid salt fines being attrited from the particles by the feed gas, said fluidized bed of particles also being cooled by indirect heat transfer to recover heat therefrom; employing cooled solid particles for contacting the effluent gas; and passing heated feed gas, containing attrited salt fines, to one of the first and second reaction zones.

Claim 17

In a system for producing a chlorinated hydrocarbon wherein a molten salt containing the higher and lower valent chlorides of a multivalent metal is oxidized in a first reaction zone and molten salt from the first reaction zone is employed in a second reaction zone for producing chlorinated hydrocarbon, and wherein effluent gas withdrawn from the second reaction zone includes volatized salt, the improvement for recovering heat from the effluent gas, comprising: contacting the effluent gas with solid particles in a dilute phase transport contact zone, said solid particles being at a temperature at which vaporized salt condenses from the gas onto the solid particles, said solid particles cooling the effluent gas; separating the solid particles containing condensed salt from the effluent gas; further cooling the effluent gas by indirect heat transfer to recover further heat therefrom; introducing separated solid particles containing condensed salt into a cooling zone wherein the particles are maintained as a fluidized bed by at least a portion of a feed gas to one of the first and second reaction zones, said fluidizing gas being heated by the particles and partially cooling the particles, with solid salt fines being attrited from the particles by the feed gas, said fluidized bed of particles also being cooled by indirect heat transfer to recover heat therefrom; employing cooled solid particles for contacting the effluent gas; and passing heated feed gas, containing attrited salt fines, to one of the first and second reaction zones.

Claim 18

The process of claim 14 wherein the effluent gas includes water vapor and some hydrogen chloride, said further cooling of the effluent being to a temperature above the dew point of water in the effluent gas.

Claim 19

The process of claim 15 wherein the further cooled effluent gas includes attrited salt fines, and aqueous hydrogen chloride is condensed therefrom, said condensed aqueous hydrogen chloride including dissolved salt fines being recycled to the first reaction zone.

Claim 20

The process of claim 16 wherein the fluidized bed of particles is cooled by indirect heat transfer with water to generate steam.

Claim 21

The process of claim 17 wherein the effluent gas is further cooled by indirect heat transfer with water to produce steam.

Claim 22

The process of claim 14 wherein the molten salt contains cuprous and cupric chloride.

Claim 23

The process of claim 14 wherein solid salt fines are attrited from the solid particles by the fluidizing gas and the effluent gas in equilibrium with salt condensation onto the solid particles.

Claim 24

The process of claim 14 wherein the fluidizing gas is a feed to the second reaction zone.

Claim 25

The process of claim 14 wherein an oxidation effluent gas, containing vaporized salt, is withdrawn from the first reaction zone, and further comprising; contacting the oxidation effluent gas with solid particles in a dilute phase transport contact zone, said solid particles being at a temperature at which vaporized salt condenses from the oxidation effluent gas onto the solid particles, said solid particles cooling the oxidation effluent gas; separating the solid particles containing condensed salt from the oxidation effluent gas; further cooling the oxidation effluent gas by indirect heat transfer to recover further heat therefrom; introducing separated solid particles, containing condensed salt, into a cooling zone wherein the particles are maintained as a fluidized bed by at least a portion of a feed gas to the first reaction zone, said fluidizing gas being heated by the particles and partially cooling the solids, with solid salt fines being attrited from the particles by the feed gas, said fluidized bed of particles also being cooled by indirect heat transfer to recover heat therefrom; employing cooled solid particles for contacting the oxidation effluent gas; and passing heated feed gas, containing attrited salt fines from the cooling zone to the first reaction zone.

Claim 26

A process for recovering vaporized molten salt from a gas produced in a reaction zone employing a molten salt mixture containing cuprous and cupric chloride, comprising: (a) withdrawing from the reaction zone a gas containing reaction product and vaporized molten salt, as an impurity, said vaporized molten salt comprising cuprous and cupric chloride; (b) contacting said gas with solid particles, said solid particles being at a temperature at which vaporized molten salt condenses from the gas onto the solid particles, said gas contacting also attriting solid fines of cuprous and cupric chloride from the solids in equilibrium with the condensation; (c) separating said gas, containing solid fines from the solid particles; (d) separating solid fines from the gas; (e) recycling solid fines to the reaction zone; (f) cooling said solid particles to maintain said solid particles at a temperature at which vaporized molten salt condenses from the gas; and (g) employing cooled solid particles in step (b).

Claim 27

A process for recovering vaporized molten salt from a gas produced in a reaction zone employing a molten salt mixture containing cuprous and cupric chloride, comprising: (a) withdrawing from the reaction zone a gas containing reaction product and vaporized molten salt, as an impurity, said vaporized molten salt comprising cuprous and cupric chloride; (b) contacting said gas with solid particles, said solid particles being at a temperature at which vaporized molten salt condenses from the gas onto the solid particles, said gas contacting also attriting solid fines of cuprous and cupric chloride from the solids in equilibrium with the condensation; (c) separating said gas, containing solid fines from the solid particles; (d) separating solid fines from the gas; (e) recycling solid fines to the reaction zone; (f) cooling said solid particles to maintain said solid particles at a temperature at which vaporized molten salt condenses from the gas; and (g) employing cooled solid particles in step (b).

Claim 28

The process of claim 23 wherein said gas is contacted with said solid particles with the solid particles being employed as a fluidized bed, said solid particles being cooled in said fluidized bed by indirect heat transfer with a heat transfer fluid to thereby recover heat while effecting said cooling.

Claim 29

The process of claim 24 wherein said gas withdrawn from the reaction zone is essentially free of water.

Claim 30

A process for recovering vaporized molten salt from a gas produced in a reaction zone employing a molten salt mixture containing cuprous and cupric chloride, comprising: (a) withdrawing from the reaction zone a gas containing reaction product and vaporized molten salt, as an impurity, said vaporized molten salt comprising cuprous and cupric chloride; (b) contacting said gas with solid particles comprised of at least one member selected from the group consisting of copper, cuprous chloride and cupric chloride by suspending the solid particles in the gas, said solid particles being at a temperature at which vaporized molten salt condenses from the gas onto the solid particles; (c) separating said gas from the solid particles; (d) cooling said separated solid particles in a fluidized bed to maintain said solid particles at a temperature at which vaporized molten salt condenses from the gas, said cooling being effected by indirect heat transfer with a heat transfer fluid for heat recovery; (e) employing cooled solid particles from the fluidized bed in step (b); and (f) periodically introducing solid particles containing condensed salt into the reaction zone.

Claim 31

A process for recovering vaporized molten salt from a gas produced in a reaction zone employing a molten salt mixture containing cuprous and cupric chloride, comprising: (a) withdrawing from the reaction zone a gas containing reaction product and vaporized molten salt, as an impurity, said vaporized molten salt comprising cuprous and cupric chloride; (b) contacting said gas with solid particles comprised of at least one member selected from the group consisting of copper, cuprous chloride and cupric chloride by suspending the solid particles in the gas, said solid particles being at a temperature at which vaporized molten salt condenses from the gas onto the solid particles; (c) separating said gas from the solid particles; (d) cooling said separated solid particles in a fluidized bed to maintain said solid particles at a temperature at which vaporized molten salt condenses from the gas, said cooling being effected by indirect heat transfer with a heat transfer fluid for heat recovery; (e) employing cooled solid particles from the fluidized bed in step (b); and (f) periodically introducing solid particles containing condensed salt into the reaction zone.

Claim 32

The process of claim 26 wherein said gas withdrawn from the reaction zone is essentially free of water.