Fatty oil ethoxylate and process for preparing the same

Abstract

The grease ethoxylate is characterized in that it comprises the following forms: R is C1-30 hydrocarbon radicals or their mixtures; x, y, z are the same or different; x + y + z=1-180. The invention comprising the following steps: mixing grease and catalyst with each other; replacing the air in reactor with nitrogen; Adjusting the mixture to reaction temperature and operating pressure; leading-in ethylene oxide while keeping reaction pressure; aging for 10-20 minutes and cooling to get product. The invention has the advantages of non-toxicity, non-irritating and good compatibility with skin.

Description

technical field [0001] The invention belongs to a kind of nonionic surfactant, in particular to an ethoxylate of oil and a preparation method. Background of the invention [0002] Oleochemicals in the traditional sense generally pre-esterify and transesterify oils and fats to obtain fatty acid methyl esters, hydrogenate methyl esters to obtain fatty alcohols, and then prepare alcohol ether nonionic surfactants through ethoxylation. . [0003] [0004] The process route of this process is long, and the preparation of methyl ester also needs to go through operations such as washing, dehydration, and distillation, and the process is cumbersome. Due to the collection of by-product methanol, a frozen brine system needs to be configured, and methyl ester hydrogenation requires high temperature and high pressure, so the equipment is complicated, resulting in high product costs. In addition, the irritation and ecotoxicity of alcohol ether nonionic surfactants are not ideal. The...

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Problems solved by technology

[0004] This process has a long process route, and the preparation of methyl ester still needs to go through operations such as washing, dehydration, and distillation, and the process is cumbersome.

Due to the collection of by-product methanol, a frozen brine system needs to be configured, and methyl ester hydrogenation requires high temperature and high pressure, so the equipment is complicated, resulting in high product costs. In addition, the irritation and ecotoxicity of alcohol ether nonionic surfactants are not ideal. The foam is too rich, it is not easy to rinse

However, it is difficult to directly synthesize non-ionic products from oils and fats by one-step ethoxylation

Natural oils are mainly triglycerides, not only the raw materials themselves have no active hydrogen connected with heteroatoms, but also contain three long chains in the molecule, with large molecular weight and large steric hindrance. Traditional ethoxylation catalysts such as sodium hydroxide , Potassium hydroxide is difficult to achieve an effective catalytic effect, the catalytic speed is extremely slow, the reaction conversion rate is low, the content of unreacted oil is high, and the content of by-products such as polyethylene glycol is high

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