Methanol production device and production method

Abstract

The invention relates to a methanol production device and production method; the methanol production device comprises a methanol synthesis reactor, a heat exchange device, a high-pressure alcohol separation tank, a cooler, a methanol separator, a low-pressure alcohol separation tank, a wax collector and a rectification system; the high-pressure alcohol separation tank is used for separating gas-liquid-wax three phases output by the heat exchange device; the cooler is used for cooling a gas phase output by the high-pressure alcohol separation tank; the methanol separator is used for further separating the cooled gas phase; the low-pressure alcohol separation tank is used for receiving the liquid phase output by the high-pressure alcohol separation tank and separating the liquid phase; and the wax collector is used for receiving wax output by the high-pressure alcohol separation tank and the low-pressure alcohol separation tank. Before a reaction product enters the water cooler, byproducts such as methanol and higher alcohol in the product are preliminarily separated by utilizing the high-pressure alcohol separation tank, so that a downstream rectification system is prevented from being blocked; and meanwhile, the byproducts such as higher alcohol are recycled as fuel by utilizing the wax collector, so that the energy is saved and the consumption is reduced.

Description

technical field [0001] The invention relates to a methanol production device and a production method. Background technique [0002] Methanol production technologies currently mainly include single-stage reaction technology, series technology, and series-parallel technology. The mainstream catalyst for methanol synthesis catalyst is copper-based catalyst. The reaction is generally carried out under high temperature and high pressure. A series of by-products are produced during the reaction process. Higher alcohols and other by-products increase in a large amount. These by-products form wax after cooling, which will cause blockage of downstream air coolers and water coolers. Wax being brought to the downstream rectification system will cause blockage of the rectification tower bottom pump, increase rectification consumption, and seriously will affect product purity. At the same time, these by-products are also high-efficiency organic fuels and have the value of recycling. ...

AI Technical Summary

Problems solved by technology

[0003]In the existing methanol production technology, in order to solve the adverse effects brought by the above-mentioned by-products, one is that the reaction product is directly subjected to air-gas heat exchange, air cooling, and water cooling to After 40°C, it directly enters the methanol separator for gas-liquid separation. In practical applications, waxing and clogging of the cooler often occur, resulting in a decrease in cooler efficiency and inconvenience to production operations; After heating, add a combined wax remover before the air cooling and water cooler, and conduct preliminary gas-liquid separation for high-temperature products. Although the problem of wax deposition and blockage can be solved to a certain extent, the investment cost of equipment is high and the wax separation is not complete.

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