Preparation and usage method of fatty alcohol ethoxylation reaction catalyst

Abstract

The invention aims to provide a preparation and usage method of a fatty alcohol ethoxylation reaction catalyst. The catalyst is a highly-acid mesoporous molecular sieve MSU-S, and the silica-alumina ratio of the catalyst is in a range of 22:1-66:1; the dosage of the catalyst is 1%-20% of the mass of fatty alcohol, the operating temperature is in a range of 120-220 DEG C, and the operating pressure is in a range of 0.05-10MPa. The catalyst is high in activity, recyclable, environment-friendly, high in fatty alcohol conversion ratio and narrower in product molecular weight distribution, and a reaction process can be finished in any one of existing ethoxylation devices.

Description

Technical field: [0001] The invention belongs to the technical field of chemical industry, and relates to a catalyst for preparing fatty alcohol polyoxyethylene ether by ethoxylation of fatty alcohol and its application. Background technique: [0002] Fatty alcohol polyoxyethylene ether is a kind of important nonionic surfactant, and its preparation method is fatty alcohol ethoxylation reaction. Ethoxylation refers to the stepwise addition reaction between ethylene oxide and active hydrogen-containing compounds. The traditional ethoxylation catalyst is an acid or alkali dissolved in the liquid phase, and the product has a wide molecular weight distribution and many by-products. In recent years, solid catalysts such as various magnesium-aluminum composites and hydrotalcites have been used in ethoxylation reactions, and a good narrow distribution effect has been achieved, but the reaction temperature is too high and the catalyst activity is relatively poor. With the continuo...

AI Technical Summary

Problems solved by technology

In 2005, Song Weiming and others studied the catalytic properties of mesoporous molecular sieve Al-MCM-41 in the ethoxylation reaction of iso-octanol and obtained good results. However, due to the poor hydrothermal stability of Al-MCM-41, The stability of the catalyst is not good

(2) US4210764 reported an alkaline earth metal oxide and its composite as a catalyst for ethoxylation. Compared with traditional catalysts, the narrow distribution of products is better, the by-products are reduced, and the conversion rate of starting materials is increased. High but its disadvantage is that there is a long induction period, which is not conducive to industrial production

However, some patents, such as US4453023 and US5220077, use polybasic acids such as phosphoric acid, citric acid and oxalic acid as cocatalysts, so that the reaction induction period is significantly shortened, and the reaction rate is greatly improved. But at the same time, the product distribution is greatly affected, and The catalyst is not easy to separate from the product, affecting product quality