Preparation method of organic vulcanizing agent for hydrogenation catalyst pre-vulcanizing

Abstract

The present invention discloses a preparation method of an organic vulcanizing agent for hydrogenation catalyst pre-vulcanizing. According to the present invention, in the presence of a catalyst, isobutylene, 1-butene or 2-butene, or a mixture comprising two or three selected from isobutylene, 1-butene and 2-butene reacts with sulphur to produce the required additive product; the consumption of the catalyst used in the method is low, the catalyst can be dissolved in the product, the performance of the product during the subsequent use process is not affected, and the catalyst is not required to be separated from the product; and the preparation method has characteristics of simple process, high yield, low production cost and no production of dust, wastewater and waste residue, belongs to the environmentally friendly green process technology, and is easily subjected to industrialization promotion.

Description

technical field [0001] The invention belongs to the technical field of refining aids in fine chemical industry, in particular relates to a method for synthesizing an organic vulcanizing agent presulfurized by a hydrogenation catalyst, in particular to a method for preparing sulfide butene. It also belongs to the technical field of sulfides of acyclic unsaturated carbon frame. Background technique [0002] Hydrogenation catalysts are composed of active components in an oxidized state and a carrier. During use, the active components in an oxidized state can only be converted into sulfide forms to have higher activity. Therefore, the hydrogenation catalyst must be presulfurized with a presulfidation agent before use. The vulcanizing agent is easy to decompose during the pre-sulfurization process, and can provide sufficient sulfur to convert the metal oxides in the catalyst into metal sulfides. There are many types of vulcanizing agents, but the most common ones are some organ...

AI Technical Summary

Problems solved by technology

Dimethyl disulfide is still used in most domestic refineries due to its high sulfur content, good oil solubility and low price. However, dimethyl disulfide has a low flash point and has relatively strong irritating, suffocating odor and toxicity. , not convenient for production, transportation, storage and use

Dibutyl polysulfide has a high flash point, low odor, low toxicity, and good performance. In recent years, products have been put on the market abroad, such as Lubrizol's SZ-54 (sulfur content is 54%), etc., domestic Although there is a similar production technology of diisobutyl polysulfide (that is, isobutylene sulfur that people often say), its low sulfur content, unpleasant smell, and serious corrosion are generally only used as extreme pressure and antiwear agents for lubricating oils. How to develop a hydrogenation catalyst presulfidant with high sulfur content and low odor in a targeted manner to solve the problem of environmental protection in production has become a top priority

Dibutyl polysulfide generally adopts sulfur monochloride (S 2 Cl 2 ) and alkali metal (or alkaline earth metal) sulfide and isobutene through addition reaction, sulfuration dechlorination reaction, crude product refining, etc., this process has many insurmountable shortcomings: 1) The production process is long, the process control is difficult, and the product There will be a trace amount of chlorine that is difficult to remove, the conversion rate of raw materials is low, and the production cost is high; 2) A large amount of waste water and waste residues are generated, causing great pollution, and it is difficult to treat the three wastes, which is not good for the environment: 3) The product has a strong odor, which limits its promotion and use ; 4) The technological process is complicated, and the corrosion of the equipment by raw materials and intermediate products is quite serious

The disadvantage of this method is that it is difficult to avoid the generation of waste water and other pollutants, and the product has a heavy odor. Although the recycling of the catalyst aqueous solution has been realized, the process flow is relatively long and the product yield is relatively low.

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