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Method for preparing methylbenzene or dimethylbenzene by alkylating benzene with methanol

A xylene and alkylation technology, applied in chemical instruments and methods, organic chemistry, molecular sieve catalysts, etc., can solve the problems of low efficiency and no teaching of desulfurization technology, and achieve the effect of convenient adjustment and high selectivity

Inactive Publication Date: 2010-01-13
山西恒扬科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this patent is that due to the low efficiency of extraction desulfurization technology, it has been gradually eliminated by industrial processes and replaced by hydrodesulfurization technology
At the same time, the patent does not teach us whether benzene can be converted into toluene and the efficiency of the conversion when methanol is used as the alkylation raw material

Method used

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  • Method for preparing methylbenzene or dimethylbenzene by alkylating benzene with methanol

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Install a small-scale fixed-bed methanol and benzene alkylation test device to produce toluene and xylene according to the flow chart of the attached drawing. All reaction devices are made of stainless steel. In an alkylation reactor with an inner diameter of 6 mm, 10 ml of molecular sieve catalyst was filled, and the catalyst was exchanged HZSM-5 molecular sieve. The raw material benzene and the alkylating reagent methanol are respectively fed by micro metering pumps. Control the parameters of the alkylation reaction, collect and analyze the products, and calculate the reaction results. The different reaction parameters and reaction results are shown in Table 1.

[0034] Table 1 Example 1 process parameters and reaction results

[0035] serial number

Embodiment 2

[0037] With embodiment 1, change benzene alcohol molar ratio, the reaction result that obtains is shown in Table 2.

[0038] Table 2 embodiment 2 process parameter and reaction result (benzyl alcohol mol ratio changes)

[0039] serial number

Embodiment 3

[0041] With embodiment 1, change reaction temperature, the reaction result that obtains is shown in Table 3.

[0042] Table 3 Example 3 process parameters and reaction results

[0043] serial number

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Abstract

The invention relates to a method for preparing methylbenzene or dimethylbenzene by alkylating benzene with methanol, comprising the following steps: raw material benzene and recycle benzene rectified to be recovered are mixed together with the methanol, mixed materials exchange heat with materials on an outlet of an alkylation reactor, and then the mixed materials are heated to achieve alkylation reaction temperature and subject to alkylation reaction to obtain a product under the condition that an acidic catalyst exists; the product is cooled by water to reduce temperature and then subjects to oil-water separation to obtain a water phase and an oil phase, wherein the water phase is purified to be recycled, the oil phase is rectified to be separated to obtain the benzene, the methylbenzene and the dimethylbenzene, and the methylbenzene and the dimethylbenzene are used as target products to separate from a reaction system; and unreacted benzene is returned to be circulated and continuously reacted together with the raw material benzene. The invention has high catalyst selectivity and can conveniently regulate the selectivity of the methylbenzene and the dimethylbenzene.

Description

technical field [0001] The invention belongs to a method for preparing toluene or xylene, in particular to a method for preparing toluene or xylene by alkylation of benzene and methanol. Background technique [0002] Benzene, toluene, and xylene are important basic chemical raw materials with a wide range of uses. In recent years, due to the rapid expansion of coking capacity, the recovery and refining technology of coking crude benzene has been vigorously developed, and the main product of coking crude benzene is benzene, accounting for about 70% of the total crude benzene. , disturbed the balance of triphenyl in petrochemical products to a certain extent, and the excess of benzene may appear in the next few years. [0003] Existing patents and literature extensively describe how to convert toluene to p-xylene and how to increase the selectivity of p-xylene. The Chinese patent 200610069662.5 applied by Sandy Basic Industry Co., Ltd. describes a preparation technology of Z...

Claims

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Application Information

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IPC IPC(8): C07C15/06C07C15/08C07C2/88B01J29/70B01J29/40B01J29/08B01J29/18
CPCY02P20/52
Inventor 杨恒李莉吕建宁李延生杨文书王建平
Owner 山西恒扬科技有限公司
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