A coke oven process for synthesizing gasoline from methanol and co-producing natural gas and hydrogen

Abstract

A process for synthesizing gasoline through methanol and co-producing natural gas and hydrogen in a coke oven. The coke oven gas is eluted with low-temperature methanol to remove sulfur and carbon dioxide. After removing sulfur and carbon dioxide, the coke oven gas enters cryogenic methane for separation, and the separated liquid The phase methane product is sent to the LNG storage tank, while the remaining coke oven gas is divided into two parts. The first part is sent to the pressure swing adsorption to remove hydrogen. The second part of the coke oven gas is mixed with further desulfurization and mixed with part of the carbon dioxide gas from the low-temperature methanol wash, the cycle gas of the methanol separator and part of the cycle gas of the cycle gas compressor to synthesize methanol, and then carry out the synthetic oil reaction, and then the oil phase is processed into oil Products are separated to obtain fuel gas, liquefied petroleum gas, heavy oil and gasoline products. The invention has the advantages of simple technological process, less equipment investment and low energy consumption.

Description

technical field [0001] The invention belongs to a technique for synthesizing gasoline from coke oven gas through methanol and co-producing natural gas and hydrogen. [0002] technical background [0003] my country has an energy structure rich in coal, poor in oil and low in gas, especially the contradiction between supply and demand of oil is very prominent. In 2013, my country's dependence on foreign oil has reached 58.1%, and it is expected that in 2020, my country's foreign dependence on oil will reach 65%, making national energy security, economic security and social security face great challenges. Therefore, the development of oil alternative energy is an important way to alleviate the contradiction between oil supply and demand and ensure national security. [0004] The conversion of methanol to gasoline was first proposed by the Mobil Corporation of the United States in the patent US3931349 in 1976. Specifically, methanol was first prepared in Cu / Al 2 o 3 The catal...

AI Technical Summary

Problems solved by technology

In 2012, my country's coke output reached 443 million tons, if one ton of coke produced 430m 3 Calculation of coke oven gas, the by-product coke oven gas in that year alone was as high as 190.5 billion m 3 , of which about 70% of the coke oven gas is used for coke oven heating and domestic gas, while the remaining nearly 57 billion m 3 Coke oven gas has not been utilized, resulting in serious waste of resources and environmental pollution

However, the existing industrial methanol-to-gasoline processes require the use of refined methanol (methanol concentration ≥ 99.9%) as a raw material, so that methanol produced from coke oven gas needs to pass through a methanol refining unit, and there is residual heat in the separate coke oven gas-to-methanol technology Waste, and the contradiction of insufficient heat from methanol conversion to gasoline leads to the disadvantages of complex process, large equipment investment and high energy consumption in the final technology. At the same time, considering the limited production scale of coke oven gas through methanol to oil, the above-mentioned problems existing in the process extremely sensitive issue

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