Energy-saving and emission-reducing technique for producing propane epoxide by using hydrogen peroxide epoxidation propylene

Abstract

The invention relates to an energy-saving and emission-reducing technique for producing propane epoxide by using hydrogen peroxide epoxidation propylene, belonging to the field of petrochemical technology. The technique comprises a reaction part, a separation part and a tail gas treatment part, and is characterized in that propylene and hydrogen peroxide have an epoxidation reaction through a Ti-Si molecular sieve at medium pressure and low temperature; the propylene and solvent have higher recovery rate, the propane epoxide meeting the requirement of commercial-grade purity can be obtained by extractive distillation, and the joint product of propylene glycol monomethyl ether can be prepared by azeotropic distillation and purification; after part of tail gas is condensed and absorbed and the propylene is recovered, the tail gas reaches the standard and is discharged; extracting agent, absorbing agent and entrainer which are needed by the technique are in closed cycle in the process flow; and medium-pressure operation is adopted by a propylene tower to ensure water-cooling on the top of the tower, and thermal energy can be recovered by multiple-effect rectification and matching of streams. The technique has the effect and the advantage that the new energy-saving and environment-friendly technique for producing the propane epoxide can generate remarkable economic and social benefits.

Description

technical field

[0001] The invention belongs to the field of petrochemical industry, and relates to an energy-saving and emission-reduction process for producing propylene oxide (PO) by epoxidizing propylene with hydrogen peroxide, wherein the epoxidation is a medium-pressure low-temperature reaction carried out on a titanium-silicon molecular sieve, and the process flow particularly It involves heat integration, propylene recovery, propylene oxide purification, propylene glycol monomethyl ether purification, tail gas treatment and other technologies. Background technique

[0002] Propylene oxide is an important basic organic chemical raw material, and it is the third largest organic chemical product in propylene derivatives after polypropylene and acrylonitrile. There are two main production processes of propylene oxide in industry: chlorohydrin method and co-oxidation method. The chlorohydrin method was used in industrial production earlier, but it has disadvantages such ...

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