Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfate esters
Patent
1995-11-14
1998-06-23
Chan, Nicky
Organic compounds -- part of the class 532-570 series
Organic compounds
Sulfate esters
558 31, 558 34, 558 38, 558 39, C07C30506, C07C30510
Patent
active
057707561
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/US94/01023 filed Jan. 28, 1994, published as WO94/18160 Aug. 18, 1994.
TECHNICAL FIELD
The present invention relates to the manufacture of high active alkyl sulphate solutions.
BACKGROUND OF THE INVENTION
Currently, there is high interest to provide high active surfactant solutions. These products would provide advantages to the consumer, who has a product which can be used in lower amounts, and to the producer, who has lower shipping costs.
In the manufacture of highly concentrated alkyl sulphates solutions neutralization is conventionally affected with aqueous solutions of neutralizing agents.
A major difficulty, though, is finding an inexpensive and efficient way to produce said high active sulphate solution.
It has generally been found that the total concentration of active material was limited up to critical levels. At the critical level the solution sets into an immobile gel or phase separation occurs. It is well known in the art, to use flow aids and viscosity modifiers so that higher concentrations can be attained. Such processing aids can adversely affect the properties of the end product and increases the cost of the product.
We have now discovered that it is possible to increase the concentration of active material by reacting alkylsulphates with organic amines in a neutralization system.
According to the process of the present invention, a highly concentrated alkyl sulphate solution is provided, which is isotropic and freeflowing at room temperature without the need of adding cosolvents or viscosity modifiers. According to one embodiment of the present invention a process is provided in which alcohol and/or nonionic surfactants are added during neutralization. According to another embodiment, a highly concentrated mixture of alkylsulphate and alkyl ether sulphate solution is provided.
SUMMARY OF THE INVENTION
The present invention relates to a process for producing isotropic high active alkyl sulphate solutions, comprising the steps of adding and mixing an alkyl sulfuric acid having a chain length of C.sub.12 -C.sub.18, with an organic amine to produce a neutralized product having substantially no water.
According to another embodiment of the present invention, the present invention relates to a process for producing high active alkyl sulphate solutions in which alcohol and/or nonionic surfactants are added during neutralization.
BRIEF DESCRIPTION OF THE DRAWING
The Figure shows a phase diagram drawn from the data provided in Table 1 for monoethanolamine (MEA), 1,2 propanediol, and water wherein structured liquid 1 and isotropic liquid 2 are shown.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a process for producing isotropic high active alkyl sulphate solutions, comprising the steps of adding and mixing an alkyl sulfuric acid having a chain length of C.sub.12 -C.sub.18, with an organic amine to produce a neutralized product having substantially no water.
The C.sub.12-18 alkyl sulfuric acid can be made by any sulfation process, but preferably are sulfonated with SO.sub.3 in air in a falling film reactor. The alkyl sulfate can be obtained from alifatic alcohols with an average from 12-18 carbon atoms, produced by reaction of a triglyceride obtained from animal fat or palm oil and sulfonation of the alifatic alcohol. Preferred alkylsulfuric acids are produced from C.sub.12 -C.sub.14 natural fatty alcohol and C.sub.12 -C.sub.15 synthetic fatty alcohol.
The alkyl sulfuric acid may be present as such or as a mixture with other compounds. Examples of such compounds are alkyl alkoxylated sulfuric acids. In this case, the process according to the present invention provides a mixture of high active alkyl sulfate and alkyl ether sulfate solutions. Suitable alkyl alkoxylated sulfuric acids include acids of the formula RO(A).sub.m SO.sub.3 H, wherein R is an unsubstituted C.sub.10 -C.sub.24 alkyl or hydroxyalkyl group having a C.sub.10 -C.sub.24 alkyl component, preferable a C.sub.12 -C.sub.20 alkyl or hydroxyalkyl, more preferably C
REFERENCES:
patent: 3305578 (1967-02-01), Maurer et al.
patent: 4645627 (1987-02-01), van Paassen et al.
Blake Alan David
Geudens Jozef Philomena
Mather Peter Geoffrey
Chan Nicky
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Yetter Jerry J.
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