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Process for producing aromatic hydrocarbons

A technology for aromatic hydrocarbons and a manufacturing method, which is applied in the directions of hydrorefining of aromatic hydrocarbons, chemical instruments and methods, and purification/separation of hydrocarbons, etc., can solve problems such as catalyst damage in waste gas treatment, and achieve the effect of reducing sulfur concentration

Active Publication Date: 2022-02-15
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, when sulfur-containing petrochemicals are used as fuel, there are problems such as easy release of sulfur oxides into the air and damage to exhaust gas treatment catalysts

Method used

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  • Process for producing aromatic hydrocarbons
  • Process for producing aromatic hydrocarbons

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Embodiment 1～10

[0089] As shown in Table 1, as the raw materials of aromatic hydrocarbons to be refined, pyrolysis gasoline (hydrocarbons) with a sulfur content of 70.0 wt. ppm to 816.6 wt. Flow through equipment and piping made of chromium-containing stainless steel and molybdenum-containing carbon steel, and flow through the tube side of the shell-and-tube heat exchanger designated by TEMA (Heat Exchanger Manufacturers of America), thereby cooling to more than 205°C and below 130°C. At this time, the transit time (residence time) in the system in the temperature range of 205° C. to 130° C. is 19.0 seconds to 36.1 seconds. Furthermore, the sulfur content contained in the treated purified aromatic hydrocarbons (liquid hydrocarbons) was all 0.2 wtppm or less (see Table 1). The concentration of CHT contained in the purified aromatic hydrocarbon after the treatment is 0.5 ppm or less in terms of sulfur concentration. The treated refined aromatic hydrocarbons include benzene, toluene, xylene an...

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Abstract

The present invention provides a method for producing purified aromatic hydrocarbons capable of stably producing purified aromatic hydrocarbons having a low sulfur content, purified aromatic hydrocarbons having a low sulfur content, and the like. A method for producing purified aromatic hydrocarbons, characterized by comprising at least: a hydrogenation step of hydrogenating an aromatic hydrocarbon raw material; and a heat exchange step of supplying the purified aromatic hydrocarbons after the hydrogenation step to a heat exchanger for cooling , the above-mentioned heat exchange step is to perform heat exchange on the above-mentioned refined aromatic hydrocarbons under the condition that cyclohexanethiol (CHT) is not by-produced.

Description

technical field [0001] The present invention relates to a method for producing petrochemical raw materials using crude oil as a raw material, and in particular, relates to a method for producing aromatic hydrocarbons with a low sulfur content, and the like. Background technique [0002] In recent years, it has been desired to reduce the sulfur concentration in petrochemicals. For example, when sulfur-containing petrochemicals are used as fuel, there are problems such as easy release of sulfur oxides into the air and damage to exhaust gas treatment catalysts. To eliminate these problems, aromatic hydrocarbons, which are often the feedstock for petrochemicals, are hydrogenated during crude oil refining. Here, most of the sulfur content in the crude oil is converted into hydrogen sulfide, which is then separated in a process such as a distillation tower and subjected to adsorption treatment, etc., thereby suppressing the sulfur concentration in the obtained petrochemicals to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/00C07C7/163C07C15/02C07C15/04C07C15/06C07C15/08
CPCC07C7/163C07C15/02C07C15/04C07C15/06C07C15/08C10G45/00C10G45/44C10G45/48
Inventor 高桥豪佐藤少谦中川乔谅
Owner MITSUBISHI CHEM CORP