System and method for preparing ethylene glycol from synthesis gas

Abstract

The invention discloses a system and a method for preparing ethylene glycol from synthesis gas. The system comprises a raw material gas purification system and a CO extraction and storage cold box system, wherein the raw material gas purification system consists of a front-end purification unit, a molecular sieve adsorber, a regenerated gas heater, a dust precision filter, a regeneration cooler and a low-temperature methanol washing unit; the C0 purification cold box system is composed of a cold box main heat exchanger, a demethanizer, a hydrogen-rich gas flash tank, a methanol synthesis device, a stripping tower, a low-pressure conversion device, a denitrification tower, a demethanizer, a fuel gas pipe network and a DMO device. The system greatly reduces the circulating nitrogen, obviously reduces the energy consumption of the circulating nitrogen compressor, can improve the production efficiency of domestic coal chemical industry related enterprises, reduces the production cost, provides high-quality and low-cost products for the ethylene glycol industry, better meets the production requirements of coal chemical industry and the like, supports the development of the coal chemical industry, and has wide application prospects. Meanwhile, the conditions of high energy consumption and high pollution of the existing process are improved.

Description

technical field [0001] The invention relates to a purification system and method, in particular to a synthesis gas production system and method for ethylene glycol. Background technique [0002] Ethylene glycol, the English name ethyleneglycol, also known as "glycol", "1,2-ethylene glycol", referred to as EG, is an important organic chemical raw material. Ethylene glycol is mainly used to make polyester polyester, Polyester resins, hygroscopic agents, plasticizers, surfactants, synthetic fibers, cosmetics and explosives, and used as solvents for dyes, inks, etc., antifreeze agents for engines, gas dehydrating agents, resins, and cellophane. Wetting agent for fibers, leather, adhesives. It can produce synthetic resin PET, fiber-grade PET that is polyester fiber, bottle-grade PET for making mineral water bottles, etc. It can also produce alkyd resin, glyoxal, etc., and is also used as an antifreeze agent. [0003] Since this century, my country has started the production of...

AI Technical Summary

Problems solved by technology

No matter which end product route to choose, it needs to go through three key steps of gas production, separation and synthesis. The main components of the raw material synthesis gas are H 2 , CO, N 2 , AR, CH 4 etc., impurity N 2 , AR, CH 4 The impurities that are not conducive to the synthesis of ethylene glycol are separated. These impurities will accumulate in the entire system because they do not participate in the synthesis reaction, resulting in a decrease in synthesis efficiency and an increase in energy consumption.

Images