EP0140710A2
Expired / Lapsed
EP
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Dialkyl sulphosuccinate composition and process for its preparation
Assignee: Unilever NV
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Filing: 1984-10-30
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Granted: —
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Expires: 2004-10-30
Abstract
Abstract Dialkyl sulphosuccinates containing less than 0.3% maleate/fumarate may readily be prepared at high concentrations (77-90% by weight) by the sulphitation of the corresponding dialkyl maleates/fumarates in a mixture of C1-C4 alcohol and water, without the need for other solvents or special catalysts, because at this very high concentration level there exist coinciding regions of low viscosity at both reaction and storage temperatures. The sulphiting agent is used in solid form, and inorganic solids are removed by filtration or other physical separation methods at the end of this reaction.
Inventors
- 👤 Clifford Keith Baker
- 👤 Pieter Mari Van Dijk
- 👤 David Arthur Griffin
- 👤 Johannes Helmond
- 👤 John Arthur Rand
- 👤 Christopher Paul Stanley
- 👤 Neil Stenton
- 👤 Christopher Tombs
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 02:17
CPC Classifications
C; C07; C07C; C07C309/00; C11; C11D; C11D1/00; C11D1/02; C11D1/12; C11D1/123
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
201 words
A process for the preparation of a dialkyl sulphosuccinate composition suitable for use as a raw material for detergent compositions, which process is characterised by the steps of i) reacting together a water-soluble sulphite-ion-generating reagent in solid form, and C 4 -C 16 dialkyl maleate and/or fumarate, in a mole ratio of at least 1:1, the concentration of C 4 -C 16 dialkyl maleate and/or fumarate being chosen so as to give a product concentration of from 77 to 90% by weight, the reaction being carried out in a mixture of a C 1 -C 4 alcohol and water substantially free of other solvents, the reaction mixture comprising a liquid phase and. a solid phase comprising inorganic material; and ii) separating said liquid and solid phases, whereby there is obtained a liquid phase comprising from 77 to 90% by weight of C 4 -C 16 dialkyl sulphosuccinate having a dialkyl maleate and fumarate content of less than 0.3% by weight based on the dialkyl sulphosuccinate, from 1.5 to 15% by weight of a C l -C 4 alcohol and from 5 to 20% by weight of water, said liquid phase remaining as a mobile liquid down to a temperature of 40°C.
Claim 2
Dependent Claim
201 words
A process for the preparation of a dialkyl sulphosuccinate composition suitable for use as a raw material for detergent compositions, which process is characterised by the steps of i) reacting together a water-soluble sulphite-ion-generating reagent in solid form, and C 4 -C 16 dialkyl maleate and/or fumarate, in a mole ratio of at least 1:1, the concentration of C 4 -C 16 dialkyl maleate and/or fumarate being chosen so as to give a product concentration of from 77 to 90% by weight, the reaction being carried out in a mixture of a C 1 -C 4 alcohol and water substantially free of other solvents, the reaction mixture comprising a liquid phase and. a solid phase comprising inorganic material; and ii) separating said liquid and solid phases, whereby there is obtained a liquid phase comprising from 77 to 90% by weight of C 4 -C 16 dialkyl sulphosuccinate having a dialkyl maleate and fumarate content of less than 0.3% by weight based on the dialkyl sulphosuccinate, from 1.5 to 15% by weight of a C l -C 4 alcohol and from 5 to 20% by weight of water, said liquid phase remaining as a mobile liquid down to a temperature of 40°C.
Claim 3
Dependent Claim
36 words
A process as claimed in claim 1, characterised in that the concentration of the reactants in step (i) is chosen so as to give a product concentration within the range of from 77 to 85%'by weight.
Claim 4
Dependent Claim
34 words
A process as claimed in claim 1 or claim 2, characterised in that the mole ratio of the sulphite-ion-generating reagent to the C 4 -C 16 dialkyl maleate and/or fumarate is greater then 1:1.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 3, characterised in that the water-soluble sulphite-ion-generating reagent is used in a molar excess within the range of from 2 to 10%.
Claim 6
Dependent Claim
29 words
5 A process as claimed in claim 4, characterised in that the water-soluble sulphite-ion-generating reagent is used in a molar excess within the range of from 3 to 8%.
Claim 7
Dependent Claim
31 words
A process as claimed in any one of claims 1 to 5, characterised in that the final weight ratio of C 1 -C 4 alcohol to water is at least 0.3:1.
Claim 8
Dependent Claim
23 words
A process as claimed in any one of claims 1 to 6, characterised in that the C 1 -C 4 alcohol comprises ethanol.
Claim 9
Dependent Claim
23 words
A process as claimed in any one of claims 1 to 7, characterised in that the water-soluble sulphite-ion-generating reagent comprises alkali metal metabisulphite.
Claim 10
Dependent Claim
54 words
A process as claimed in claim 8, characterised in that there is added to the reaction mixture a strongly alkaline reagent in an amount less than that required to convert all the excess of bisulphite present to sulphite but sufficient to give a final reaction pH within the range of from 6.0 to 8.5.
Claim 11
Dependent Claim
34 words
A process as claimed in claim 9, characterised in that the strongly alkaline reagent is added in an amount sufficient to give a final reaction pH within the range of from 6.5 to 7.5.
Claim 12
Dependent Claim
22 words
A process as claimed in claim 9 or claim 10, characterised in that the strongly alkaline reagent is aqueous sodium hydroxide solution.
Claim 13
Dependent Claim
25 words
A process as claimed in any one of claims 1 to 11, characterised in that in step (ii) the solid phase is removed by filtration.
Claim 14
Dependent Claim
25 words
A process as claimed in any one of claims 1 to 11, characterised in that in step (ii) the liquid phase is removed by decantation.
Claim 15
Dependent Claim
30 words
A process as claimed in any one of claims 1 to 13, characterised in that the alkyl groups of the dialkyl sulphosuccinate each have from 4 to 10 carbon atoms.
Claim 16
Dependent Claim
25 words
A process as claimed in claim 14, characterised in that the alkyl groups of the dialkyl sulphosuccinate each have from 6 to 8 carbon atoms.
Claim 17
Dependent Claim
109 words
A dialkyl sulphosuccinate composition suitable for use as a raw material for detergent compositions, characterised in that it consists essentially of a) from 77 to 90% by weight of one or more water-soluble salts of C 4 -C 16 dialkyl esters of sulphosuccinic acid, b) from 1.5 to 15% by weight of a C l -C 4 aliphatic - alcohol, and c) from 5 to 20% by weight of water, the composition containing less than 0.3% by weight of C 4 -C 16 dialkyl maleates and fumarates, based on the dialkyl sulphosuccinate (a), and having a viscosity of less then 10 poise at 40°C and 10 s -1 .
Claim 18
Dependent Claim
109 words
A dialkyl sulphosuccinate composition suitable for use as a raw material for detergent compositions, characterised in that it consists essentially of a) from 77 to 90% by weight of one or more water-soluble salts of C 4 -C 16 dialkyl esters of sulphosuccinic acid, b) from 1.5 to 15% by weight of a C l -C 4 aliphatic - alcohol, and c) from 5 to 20% by weight of water, the composition containing less than 0.3% by weight of C 4 -C 16 dialkyl maleates and fumarates, based on the dialkyl sulphosuccinate (a), and having a viscosity of less then 10 poise at 40°C and 10 s -1 .
Claim 19
Dependent Claim
26 words
A composition as claimed in claim 16, characterised in that it has a viscosity of less than 5 poise at 40°C and 10 s -1 .
Claim 20
Dependent Claim
36 words
A composition as claimed in claim 16 or claim 17, characterised in that the content of C 4 -C 16 dialkyl maleates and fumarates is less than 0.1% by weight, based on the dialkyl sulphosuccinate (a).
Claim 21
Dependent Claim
31 words
A composition as claimed in any one of claims 16 to 18, characterised in that the content of sulphite is less than 0.5% by weight, based on the dialkyl sulphosuccinate (a).
References Cited (Backward Citations)
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