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Method for adjusting product composition during coked crude benzene refining

A technology for coking crude benzene and products, which is applied in the fields of chemical instruments and methods, bulk chemical production, organic chemistry, etc., can solve the problems of no mixed aromatics alkylation technology and low efficiency of desulfurization technology, and achieve easy mass production , low price, simple process

Inactive Publication Date: 2010-01-20
山西恒扬科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
[0007] Chinese Patent Application No. 200710041508.6 discloses the application of nano-molecular sieve catalysts in the alkylation of aromatic hydrocarbons. This invention mainly involves nano-scale MCM molecular sieve catalysts. The aromatic hydrocarbon raw materials involved are also single aromatic hydrocarbons, and there is no such thing as coking crude benzene Alkylation technology of such mixed aromatics
[0009] So far, there is no technology that can achieve the purpose of adjusting the composition of aromatic products while completing the refining of coking crude benzene

Method used

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  • Method for adjusting product composition during coked crude benzene refining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In a small fixed-bed reactor, 5ml HZSM-5 molecular sieve is packed, and the crude coking benzene hydrogenation oil and methanol are used as raw materials. The main process parameters are as follows:

[0035] Benzene / alcohol molar ratio 4:1 (calculated based on pure benzene in crude benzene hydrogenated oil)

[0036] The total space velocity of the weight of raw materials is 2h -1

[0037] Reaction temperature 400℃

[0038] Reaction pressure 0.1MPa

[0039] After 24 hours of reaction, the reaction product was sampled and calculated, and the following reaction results were obtained:

[0040] Methanol conversion rate: 100%.

[0041] The composition of crude benzene hydrogenated oil and alkylation products is as follows:

[0042] Benzene Toluene Xylene Other

[0043] Crude benzene hydrogenated oil wt% 69 19 9 3

[0044] Alkylation reaction product wt% 37.76 44.03 13.06 4.75

Embodiment 2

[0045] Example 2: On the basis of Example 1, benzene was additionally recycled as a common raw material. The ratio of recycled benzene to hydrogenated oil is 1:1, and all other conditions are the same as in Example 1.

[0046] After 24 hours of reaction, the following reaction results were obtained:

[0047] Methanol conversion rate: 100%.

[0048] The composition of crude benzene hydrogenated oil and alkylation products is as follows:

[0049] Benzene Toluene Xylene Other

[0050] Crude benzene hydrogenated oil + recycled benzene wt% 86.32 9.13 3.52 1.03

[0051] Alkylation reaction product wt% 55.70 35.46 7.33 1.51

Embodiment 3-6

[0053] Process parameters are shown in Table 1. The raw material composition is the same as in Example 1 Table 1

[0054] Example 3-6 Process Parameters

[0055] Process parameters

Benzene / alcohol molar ratio (Note)

Weight of raw materials, total space velocity h -1

Reaction temperature℃

Reaction pressure MPa

Example 3

10:1

5

400

0.1

Example 4

6:1

3

400

0.1

Example 5

2:1

2

400

0.1

Example 6

1:1

1

400

0.1

[0056] Note: The benzene / alcohol molar ratio is calculated based on the pure benzene in crude benzene hydrogenated oil

[0057] After 24 hours of reaction, methanol conversion rate: 100%. The composition of crude benzene hydrogenated oil and alkylation products is shown in Table 2

[0058] Table 2 Example 3-6 Reaction Results

[0059] Product composition

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Abstract

The invention relates to a method for adjusting product composition during coked crude benzene refining. Coked crude benzene hydrogenated oil is premixed with alkylation reagent methanol. The mixture undergoes heat exchange with a material leaving an alkylation reactor and then is heated. After the temperature of the mixture reaches a reaction temperature, in the presence of a molecular sieve based catalyst, the mixture undergoes alkylation reaction so as to obtain a product. After the alkylation reaction is completed, the product is cooled by water and then undergo extraction, rectification and separation so as to obtain benzene, toluene and xylene, which leave the reaction system as target products. The method has simple procedures and can achieve the aim of reducing the benzene production amount and increasing the production amount of the toluene and the xylene by only increasing an alkylation unit without changing the main low-temperature hydrofining procedures of coked crude benzene.

Description

Technical field [0001] The invention belongs to a method for refining coking crude benzene, and specifically relates to a method for adjusting the product composition during the refining of coking crude benzene. Background technique [0002] Coking crude benzene is an important chemical raw material from coal chemical industry. my country’s coking capacity exceeds 300 million tons / year, and the corresponding crude benzene production has actually exceeded 4 million tons / year. At the same time, the refining method of coking crude benzene has been gradually improved from pickling to hydrorefining. Products such as benzene, toluene and xylene have fully reached the quality of petroleum products, making my country's coking crude benzene an important source of aromatics raw materials. [0003] The main components of coking crude benzene are benzene, toluene and xylene. Among them, the content of benzene is the highest, generally about 70%, followed by toluene, about 20%, the content of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C2/88C07C7/10C07C7/04B01J29/40
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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