Dimethyl sulfide preparation method

A technology of dimethyl sulfide and methanol, which is applied in the field of preparation of dimethyl sulfide, can solve the problem of low conversion rate of methanol, and achieve the effects of stable skeleton structure, suitable acid center structure and high conversion rate

Active Publication Date: 2015-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

The conversion rate of methanol

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[0016] The invention provides a method for preparing dimethyl sulfide. The method comprises reacting hydrogen sulfide and methanol in the presence of a catalyst to synthesize dimethyl sulfide, wherein the catalyst contains a molecular sieve with a BEA structure.

[0017] According to the present invention, the silicon-aluminum molar ratio of the molecular sieve of the BEA structure (in terms of oxides, refers to SiO 2 / Al 2 o 3 , the same below) can be selected in a wide range. Preferably, in terms of oxides, the molecular sieve with the BEA structure has a molar ratio of silicon to aluminum of greater than 10 and less than or equal to 200; preferably in terms of oxides, the molecular sieve with the BEA structure has a molar ratio of silicon to aluminum of 15-100; More preferably, the molecular sieve with BEA structure has a silicon-aluminum molar ratio of 20-70 in terms of oxides. When the molecular sieve with the BEA structure has the above-mentioned preferred silicon-alu...

Embodiment 1

[0033] This embodiment is used to illustrate the preparation method of dimethyl sulfide of the present invention.

[0034] Hβ molecular sieves (performance parameters are shown in Table 1) were steam-treated at 300°C for 10 hours, then pressed into tablets, sieved, and 20-40 mesh particles were taken and packed in a tubular reaction tube with a diameter of 0.8 cm and a length of 55 cm. The catalyst The particle bed volume is 2.0cm 3 .

[0035] The reaction temperature is 300°C, the reaction pressure is 1atm, the feed molar ratio of hydrogen sulfide and methanol is 1:2, and the total gas volume space velocity is 1500h -1 Under the conditions of , the catalytic reaction for the preparation of dimethyl sulfide was carried out. The product obtained after the catalytic reaction was analyzed by gas chromatography for 3 hours, and the conversion rate of methanol and the selectivity of dimethyl sulfide were calculated according to the analysis results. The calculation results are s...

Embodiment 2

[0037] This embodiment is used to illustrate the preparation method of dimethyl sulfide of the present invention.

[0038] Hβ molecular sieves (performance parameters are shown in Table 1) were steam-treated at 200°C for 6 hours, then pressed into tablets, sieved, and 20-40 mesh particles were taken and packed in a tubular reaction tube with a diameter of 0.8 cm and a length of 55 cm. The catalyst The particle bed volume is 2.0cm 3 .

[0039] The reaction temperature is 270°C, the reaction pressure is 5atm, the feed molar ratio of hydrogen sulfide and methanol is 1:2.1, and the total gas volume space velocity is 750h -1 Under the conditions of , the catalytic reaction for the preparation of dimethyl sulfide was carried out. The product obtained after the catalytic reaction was analyzed by gas chromatography for 3 hours, and the conversion rate of methanol and the selectivity of dimethyl sulfide were calculated according to the analysis results. The calculation results are s...

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Abstract

The invention discloses a dimethyl sulfide preparation method. The method is characterized in that hydrogen sulfide reacts with methanol in the presence of a catalyst to synthesize dimethyl sulfide, wherein the catalyst contains a molecular sieve with a BEA structure. The catalyst containing the molecular sieve with a BEA structure adopted by the method can effectively catalyze the reaction of hydrogen sulfide and methanol, realizes high dimethyl sulfide selectivity and high methanol conversion rate, and still realizes high dimethyl sulfide selectivity and high methanol conversion rate after long-period use.

Description

technical field [0001] The invention relates to a preparation method of dimethyl sulfide. Background technique [0002] A large amount of hydrogen sulfide is produced during oil processing and exploitation of low-quality natural gas fields. At present, with the heavy and inferior quality of crude oil and the exploitation of more inferior natural gas fields, the amount of hydrogen sulfide resources 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 it is an important issue. [0003] The traditional way to utilize hydrogen sulfide is to selectively oxidize hydrogen sulfide to sulfur and water through the Claus process. However, the price of the product sulfur fluctuates greatly, and in the long run, it is difficult for the price of sulfur in my country to rise, and the added value of the product is low. In addition, with the strengthening of environmental regulations, the Cl...

Claims

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Application Information

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IPC IPC(8): C07C321/14C07C319/14
Inventor 关莉莉汪颖吴佳慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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