Mass production system of highly aromatic petroleum pitch

Claim 2

In a pitch production by thermal cracking including the steps of rapidly preheating a liquefied petroleum residuum to a temperature of 450°-520° C. by passing the same through a tubular heater for 0.5-15 minutes, feeding said preheated residuum through a feed flow line into a reaction vessel and thermally cracking the same by introducing an inert gas heated to a temperature of 400°-2,000° C. through a heating furnace into said reaction vessel for a direct contact with the residuum for 0.5-10 hours; the improvement comprising: feeding said preheated residuum through a plurality of parallel feed flow lines into a plurality of reaction vessels, the ratio of the number of feeding flow lines feeding said preheated residuum from said tubular heater into said reaction vessels to the total number of said reaction vessels being adjusted to be coincident with the ratio of the charging time (θC) required for charging a reaction vessel with a feeding flow of said preheated residuum to the total time (θT) required for carrying out one batch of thermal cracking in a reaction vessel where the ratio θT/θC is adjusted to be greater than 1, thereby realizing steady and continuous operations in said tubular heater and said heating furnace.

Claim 3

The pitch production of claim 1, wherein said petroleum residuum is selected from the group consisting of Duo-Sol extracts, furfural extracts, atmospheric residuums, vaccum residuums, and residuums obtained from paraffinic solvent extractions.

Claim 4

In a pitch production by thermal cracking including the steps of rapidly preheating a liquefied petroleum residuum to a temperature of 450°-520° C. by passing the same through a tubular heater for 0.5-15 minutes, feeding said preheated residuum through a feed flow line into a reaction vessel and thermally cracking the same by introducing an inert gas heated to a temperature of 400°-2,000° C. through a heating furnace into said reaction vessel for a direct contact with the residuum for 0.5-10 hours; the improvement comprising: feeding said preheated residuum through a plurality of parallel feed flow lines into a plurality of reaction vessels, the ratio of the number of feeding flow lines feeding said preheated residuum from said tubular heater into said reaction vessels to the total number of said reaction vessels being adjusted to be coincident with the ratio of the charging time (θC) required for charging a reaction vessel with a feeding flow of said preheated residuum to the total time (θT) required for carrying out one batch of the thermal cracking in a reaction vessel where the ratio θT/θC is adjusted to be greater than 1, and a time sequence with each thermal cracking reaction in said reaction vessel being retarded relative to an earlier reaction by a unit time defined as the quotient obtained by dividing the total operation time (θT) by the total number of said reaction vessels, whereby the steady and continuous operation of the tubular heater and said heating furnace is realized and the total flow volume of the heated inert gas from said heating furnace remains constant during the pitch production.

Claim 5

In a pitch production by thermal cracking including the steps of rapidly preheating a liquefied petroleum residuum to a temperature of 450°-520° C. by passing the same through a tubular heater for 0.5-15 minutes, feeding said preheated residuum through a feed flow line into a reaction vessel and thermally cracking the same by introducing an inert gas heated to a temperature of 400°-2,000° C. through a heating furnace into said reaction vessel for a direct contact with the residuum for 0.5-10 hours; the improvement comprising: feeding said preheated residuum through a plurality of parallel feed flow lines into a plurality of reaction vessels, the ratio of the number of feeding flow lines feeding said preheated residuum from said tubular heater into said reaction vessels to the total number of said reaction vessels being adjusted to be coincident with the ratio of the charging time (θC) required for charging a reaction vessel with a feeding flow of said preheated residuum to the total time (θT) required for carrying out one batch of the thermal cracking in a reaction vessel where the ratio θT/θC is adjusted to be greater than 1, and a time sequence with each thermal cracking reaction in said reaction vessel being retarded relative to an earlier reaction by a unit time defined as the quotient obtained by dividing the total operation time (θT) by the total number of said reaction vessels, whereby the steady and continuous operation of the tubular heater and said heating furnace is realized and the total flow volume of the heated inert gas from said heating furnace remains constant during the pitch production.