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Method for producing 1,2,3-trimethylbenzene from coal-based raw materials

A technology based on trimethylbenzene and coal, which is applied in the field of production of trimethylbenzene, can solve the problem of insufficient operating rate of the device, and achieve the effect of eliminating the separation and purification process of raw materials and high target product selectivity

Pending Publication Date: 2021-01-15
ZHEJIANG HUANHUA TECH CO LTD
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  • Description
  • Claims
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Problems solved by technology

With the rapid development of the coal chemical industry in recent years, the production capacity of coking benzene in my country has reached more than 4 million tons per year, and the output is about 3 million tons per year. The ratio of the total benzene production has risen to nearly 30% (others are petroleum benzene). And the operating rate of most devices is seriously insufficient

Method used

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  • Method for producing 1,2,3-trimethylbenzene from coal-based raw materials
  • Method for producing 1,2,3-trimethylbenzene from coal-based raw materials

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Embodiment 1

[0021] figure 1 Shown is the process flow diagram of the method for producing mesitylene from coal-based raw materials in the present invention. Coal-based raw materials to produce the method of mesitylene, crude methanol (80.0%) produced by coal synthesis gas, coking crude benzene (containing 90.4wt% benzene, 8.0wt% toluene, 1.5wt% xylene and 0.1wt% other impurities) As the raw material, coking crude benzene is washed with sulfuric acid and pretreated by hydrogenation (NiO-MoO 3 and Co-MoO 3 Catalyst, fixed bed), enter the alkylation reactor (fluidized bed) with crude methanol for catalytic reaction, and the obtained products are mainly trimethylbenzene, toluene, mixed xylene, a small amount of heavy aromatics and light hydrocarbons. They and unreacted benzene enter the rectification system, and then pass through the stripping tower, benzene + toluene + xylene (BTX) separation system in turn, the separated light hydrocarbons are used as fuel for the device, and the separate...

Embodiment 2

[0024] Based on embodiment 1, the difference from embodiment 1 is:

[0025] The raw material of coal-based methanol is crude methanol (methanol content 93.0wt%) produced from coal coke oven gas. Coal-based benzene is a mixture of coked crude benzene and coal tar heavy component light crude benzene, containing 79.8wt% benzene, 15.0wt% toluene, 5.0wt% xylene and 0.2wt% other impurities. The alkylation reactor is a fixed bed reactor. The catalyst used in the alkylation reaction is a sheet-like MCM-56 / nano Beta composite molecular sieve modified with 0.04% CuO and 0.1% CaO, with an external specific surface area of ​​93m 2 / g, the number of acid sites on the outer surface accounted for 32% of the total number of acid sites, and the number of weak acid and medium strong acid sites accounted for 98.1% of the total number of acid sites. Alkylation reaction conditions are: the molar ratio of methanol to aromatics (BTX) is 1:1, the reaction pressure is 2.0MPa, the reaction temperatur...

Embodiment 3

[0027] Based on embodiment 1, the difference from embodiment 1 is:

[0028] The raw material of coal-based benzene is coking crude benzene, containing 99.19wt% benzene, 0.6wt% toluene, 0.2wt% xylene and 0.01wt% other impurities; coal-based methanol is made from crude toluene produced by coal synthesis gas and coke oven gas The mixture of crude methanol contains 84.1wt% methanol; the alkylation reactor adopts a moving bed reactor. The catalyst used in the alkylation reaction is a nano-acicular ZSM-5 / flaky MCM-49 composite molecular sieve modified with 5.0% CdO and 5.0% MgO, with an external specific surface area of ​​99m 2 / g, the number of acid sites on the outer surface accounted for 36% of the total acid sites, and the number of weak acid and medium strong acid sites accounted for 97.1% of the total acid sites. The alkylation reaction conditions are: the molar ratio of methanol to aromatics (BTX) is 1:2, the reaction pressure is 5.0MPa, the reaction temperature is 700°C, the...

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Abstract

The invention relates to a method for producing 1,2,3-trimethylbenzene from coal-based raw materials. According to the method, cheap coal-based crude benzene and coal-based crude methanol are used asraw materials, an alkylation catalyst which has a large external specific surface area (more than 90 m<2> / g) and is mainly composed of weak acid and medium-strong acid (accounting for 95% or more of the total number of acid sites) and an anti-coking alkylation reaction medium (hydrogen and water or carbon dioxide and water) are adopted, and the processes of acid pickling, hydrogenation pretreatment, alkylation reaction, rectification and material circulation are conducted so as to realize high-selectivity (total packet) production of 1,2,3-trimethylbenzene. The alkylation reaction is carried out in a fixed-bed reactor, a fluidized-bed reactor or a moving-bed reactor, and the used catalyst is a flaky MCM-56, nanoneedle-shaped ZSM-5, flaky MCM-49, nanometer Beta molecular sieve modified by two metal oxide assistants or a compound of the above molecular sieves. The method provided by the invention can effectively reduce the production cost of 1,2,3-trimethylbenzene and thoroughly realizenon-petroleum route production of 1,2,3-trimethylbenzene.

Description

technical field [0001] The invention relates to a method for producing unisexylene with coal-based raw materials. Background technique [0002] Trimethylbenzene, as an important aromatic raw material, can be used to produce trimellitic anhydride and mesitylene, and is widely used in the solvent industry, and its demand is increasing year by year. At present, its production is completely dependent on petroleum resources, mainly through catalytic reforming and C produced during naphtha cracking. 9 ~C 10 Aromatic fractions are obtained separately. my country's mineral deposits are "more coal and less oil". The shortage of oil will become one of the main bottlenecks of my country's industrial development. The sustainable and healthy development of the national economy requires that my country must rely on its own resource advantages to develop the production technology of petrochemical raw materials. The strategy of "replacing oil with coal" is the development direction of ene...

Claims

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Application Information

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IPC IPC(8): C07C1/24C07C7/04C07C15/02B01J29/40B01J35/10B01J29/80
CPCC07C1/24C07C7/04B01J29/40B01J29/80B01J29/7615B01J29/76B01J29/7049B01J29/405B01J2229/20B01J2229/186B01J35/613C07C15/02Y02P20/52
Inventor 朱志荣李军辉
Owner ZHEJIANG HUANHUA TECH CO LTD
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