Method for producing clean diesel oil from synthetic gas

Abstract

The invention provides a method for producing clean diesel oil from synthetic gas. The method comprises the following steps: allowing synthetic gas to enter a tubular fixed bed reactor and contact with a catalyst for a Fischer-Tropsch synthesis reaction, wherein the interior surface of a reaction tube is smooth, and the exterior surface of the reaction tube has a groove; separating heavy hydrocarbon and light hydrocarbon out from a synthetic product; mixing light hydrocarbon with hydrogen, allowing an obtained mixture to enter a hydrorefining reactor and contact with a catalyst for a hydrogenation saturation reaction and a hydrogenation deoxidation reaction; and allowing a hydrorefining reaction product to enter a separation system, mixing separated tail oil with heavy hydrocarbon, allowing an obtained mixture to enter a hydrogenation isocraking reactor and allowing a product to enter the separation system so as to obtain an intermediate distillate oil product. The method provided by the invention overcomes the problems of hardly controllable reaction heat and difficult heat transfer and hot spots of a reactor during the Fischer-Tropsch synthesis reaction and realizes economic and effective production of the clean diesel oil directed at the characteristic that hydrocarbons are produced in the process of production.

Description

technical field [0001] The invention relates to a method for producing clean diesel oil from synthesis gas, more specifically, a method for producing diesel oil from hydrocarbons obtained through Fischer-Tropsch synthesis reaction through multiple hydrotreating processes. Background technique [0002] Hydrocarbon products are obtained from hydrogen and carbon monoxide through Fischer-Tropsch synthesis (Fischer-Tropsch synthesis). Carbon monoxide and carbon monoxide can be easily converted from coal, natural gas or biomass. This technology path has attracted great attention from the world's energy and chemical industry. Many international energy companies have developed synthetic oil processes with Fischer-Tropsch synthesis as the core. The most successful of these are South Africa's Sasol and Holland's Shell. Sasol's three plants I, II and III have an annual output of 7.2 million tons of oil products and chemicals. The PetroSA project jointly constructed by Sasol and Petro...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing clean diesel oil from synthesis gas, which not only solves the problems that the heat of reaction is difficult to control when the Fischer-Tropsch synthesis reaction occurs between hydrogen and carbon monoxide, and the problems of difficult heat transfer and hot spots exist in the reactor, but also provides a solution for The process produces hydrocarbons characterized by the most cost-effective method of producing diesel

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