Preparation method of dimethyl sulfide

A technology of dimethyl sulfide and methanol, which is used in the preparation of sulfide, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of low methanol conversion rate, and achieve stable skeleton structure, high conversion rate, and suitable acid center structure. Effect

Active Publication Date: 2015-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

The conversion rate of methanol obtained by this method is low

Method used

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  • Preparation method of dimethyl sulfide
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  • Preparation method of dimethyl sulfide

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[0016] The present invention provides a method for preparing dimethyl sulfide. The method includes: reacting hydrogen sulfide and methanol to produce dimethyl sulfide in the presence of a modified molecular sieve catalyst, characterized in that the modified The molecular sieve catalyst is prepared by first treating the molecular sieve catalyst with alkaline aqueous solution and then washing with acid solution.

[0017] According to the present invention, the modified treatment of the molecular sieve catalyst can be firstly treated with an alkaline aqueous solution, that is, the molecular sieve catalyst is placed in an alkaline aqueous solution environment, in a closed system, at a certain temperature for a period of time. Treating the molecular sieve catalyst with alkaline aqueous solution can improve the hydrothermal stability of the catalyst, thereby further improving the methanol conversion rate and the selectivity of dimethyl sulfide. Preferably, the alkaline aqueous solution...

Embodiment 1

[0049] This example is used to illustrate the preparation method of dimethyl sulfide of the present invention.

[0050] Add HZSM-5 molecular sieve (performance parameters as shown in Table 1) into a 2.0 wt% ammonia solution with a solid-to-liquid ratio of 1g molecular sieve: 10 mL ammonia solution, put it in a sealed reactor, and treat it at 80°C for 6 hours; then use 0.5 After washing with mol / L citric acid at 30℃ for 4 hours, the solid-to-liquid ratio of molecular sieve and citric acid solution is 1g molecular sieve: 5mL acid solution; after filtering, washing, drying, tableting, sieving, and taking 20-40 mesh The particles are packed in a tubular reaction tube with a diameter of 0.8 cm and a length of 55 cm. The volume of the catalyst particle bed is 2.0 cm. 3 .

[0051] The reaction temperature is 285℃, the reaction pressure is 1atm, the feed molar ratio of hydrogen sulfide and methanol is 1:2, and the total gas volumetric space velocity is 800h -1 Under the conditions, the cat...

Embodiment 2

[0053] This example is used to illustrate the preparation method of dimethyl sulfide of the present invention.

[0054] Add Hβ molecular sieve (performance parameters as shown in Table 1) into 3.0% by weight ammonia solution with a solid-to-liquid ratio of 1g molecular sieve: 18mL ammonia solution, put it in a sealed reactor and treat it at 100°C for 10h; then use 1.0mol / L tartaric acid was washed at 30°C for 5 hours, the solid-to-liquid ratio of molecular sieve and tartaric acid solution was 1g molecular sieve: 6mL acid solution; then filtered, washed, dried, compressed into tablets, sieved, and packed 20-40 mesh particles in diameter In a tubular reaction tube of 0.8cm and 55cm in length, the volume of the catalyst particle bed is 2.0cm 3 .

[0055] When the reaction temperature is 310℃, the reaction pressure is 1atm, the feed molar ratio of hydrogen sulfide and methanol is 1:2, and the total gas volumetric space velocity is 1000h -1 Under the conditions, the catalytic reaction ...

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Abstract

The invention discloses a preparation method of dimethyl sulfide. The method comprises the step of reacting hydrogen sulfide with methanol in the presence of a modified molecular sieve catalyst to generate dimethyl sulphide, and is characterized by preparing the modified molecular sieve catalyst by firstly processing a molecular sieve catalyst with an alkaline water solution and then washing the molecular sieve catalyst with an acid solution. By adopting the method, reaction between hydrogen sulfide and methanol can be effectively catalyzed, and methanol can have a higher conversion rate while higher selectivity of dimethyl sulfide can be obtained.

Description

Technical field [0001] The invention relates to a preparation method of dimethyl sulfide. Background technique [0002] Large amounts of hydrogen sulfide are produced during oil processing and the exploitation of low-quality natural gas fields. At present, with the heavy and degraded crude oil and the exploitation of more inferior natural gas fields, the amount of hydrogen sulfide resources generated from oil processing and natural gas field exploitation is gradually increasing. In the face of a large amount of hydrogen sulfide resources, how to use them is an important issue. [0003] The traditional method of utilizing hydrogen sulfide is to selectively oxidize hydrogen sulfide to sulfur and water through the Claus process. However, the price of product sulfur fluctuates greatly, and it is difficult for the price of sulfur in my country to rise in the long run, and the added value of the product is low. In addition, with the strengthening of environmental protection regulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C321/14C07C319/14B01J29/40B01J29/70
Inventor 关莉莉汪颖慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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