Method and system for preparation of glycerin alkyl ether

Abstract

The invention provides a method for preparation of glycerin alkyl ether. The method includes: (1) adding a mixed solution of tert-butyl alcohol and glycerin and liquid isobutylene simultaneously intoa fixed bed reactor filled with an acidic resin catalyst to carry out glycerin etherification reaction on the system; (2) letting the material flowing out of the fixed bed reactor into a gas separation system to be separated into a gas phase and a liquid phase; (3) letting the liquid phase material enter a tert-butyl alcohol separation system to separate tert-butyl alcohol and (4) collecting the polyether product. The invention also provides a reaction system for preparation of glycerin alkyl ether. Under the reaction conditions of a temperature of 45-80DEG C and a glycerin residence time of 0.80-2.50h, the glycerin conversion rate can reach 100%, the polyether selectivity is up to 98.6% or more, and the selectivity of an isobutylene dimer is 1.7% or below. The method lowers the reaction temperature, greatly reduces the residence time of glycerin in the fixed bed, and well controls the selectivity of isobutylene dimer.

Description

technical field [0001] The present invention relates to a method and system for preparing glycerol alkyl ether. Background technique [0002] The development of the biodiesel industry has resulted in a large global surplus of glycerin and a sharp drop in prices. How to make full and reasonable use of these cheap glycerin has become an important issue. In recent years, research hotspots have focused on the direction of using glycerol to synthesize glycerol ether as a fuel additive. The main reason is that cheap glycerin and alkylating reagents are used as raw materials for etherification reaction, that is, the by-product glycerin of biodiesel is used to reduce production costs, and the product glycerol ether can also be used as a diesel additive to improve diesel performance. In short, it will become a trend to actively carry out research on glycerol alkyl ethers, and it is in line with my country's national conditions. [0003] Glycerin tert-butyl ether is a very promisin...

AI Technical Summary

Problems solved by technology

[0010] In the process of preparing glycerol tert-butyl ether from isobutene and glycerol, isobutene is prone to dimerization reaction to obtain isobutene dimer, thereby reducing the conversion rate of isobutene into glycerol alkyl ether, and leading to carbon deposition deactivation of the catalyst, reducing Catalyst life

However, the glycerol-tert-butanol system for preparing glycerol alkyl ethers has the problem that the selectivity of monosubstituted glycerol alkyl ethers is too high (mass fraction is 20% to 50%), and the purpose of this reaction is to prepare as many disubstituted glyceryl ethers as possible. Glycerol Alkyl Ether or Trisubstituted Glycerol Alkyl Ether

[0011] At present, the total reaction time for the preparation of glycerin alkyl ether by resin catalyst is more than 7h, too long reaction time is not conducive to the industrial application of the process

Images