Environment-friendly carbon-hydrogen solvent low-pressure hydrogenation dearomatization reactor and catalyst packing method

Abstract

The invention provides an environment-friendly carbon-hydrogen solvent low-pressure hydrogenation dearomatization reactor and a catalyst packing method. The method of layered matching packing of porcelain balls of different grain diameters and catalysts of different grain diameters and different shapes is adopted, material short pass or bed layer sinking can be prevented, fluid distribution and pressure drop in a catalyst bed layer are effectively improved, distribution and mixing effects of a hydrogen cooling system are enhanced, a reaction medium and a catalyst contact evenly, the medium in the reactor flows uniformly, and the reactor size is reduced on the whole, so as to guarantee an optimum depth and speed of hydrogenation dearomatization reaction, improve yield of ideal components, reduce device investment and product processing cost and improve comprehensive utilization added value of light dydrocarbon raw materials. The environment-friendly carbon-hydrogen solvent low-pressure hydrogenation dearomatization reactor has the advantages of being high in reaction efficiency, high in production capacity, convenient to manufacture and maintain and is intelligent in temperature control; and after fractionation, the purity of an alkane product is 99% or above.

Description

Technical field: [0001] The invention relates to the technical field of petrochemical industry, in particular to an environment-friendly hydrocarbon solvent low-pressure hydrogenation dearomatization reactor and a catalyst filling method. Background technique: [0002] At present, environmentally friendly low-volatile hydrocarbon organic solvents are generally obtained by high-pressure hydrotreating and dearomatization, followed by rectification. The purpose of hydrofining dearomatization is to remove impurities such as sulfur, nitrogen, oxygen, chlorine, olefins and aromatics in the material, and some olefins will generate corresponding alkanes through addition reaction, increase the yield of alkanes, reduce the benzene content of the product, and reduce the product Additional organic emissions during use to meet the requirements of environmental protection emission indicators. The high-pressure hydrodearomatization reactor is not suitable for the production of environment...

AI Technical Summary

Problems solved by technology

The high-pressure hydrodearomatization reactor is not suitable for the production of environmentally friendly solvents with light hydrocarbon raw materials whose dry point is below 200°C: firstly, the reaction pressure of the high-pressure hydrodearomatization reactor is high, the hydrogen consumption is high, and the degree of raw material cracking into the gas phase is deep; Secondly, high-pressure hydrogenation can easily lead to catalyst deactivation and reduced mechanical strength. In addition, the matching of catalyst particle size and the unreasonable design of the filling structure in the reactor will cause the catalyst in the upper part of the reactor to be saturated, pulverized and hardened first, which hinders the flow of circulating hydrogen gas through the reactor. The uniform contact between the reaction medium and the catalyst cannot be guaranteed, and the uniform flow of the medium in the reactor cannot be achieved, resulting in an increase in the pressure difference between the inlet and outlet, and the reaction temperature is out of control, so that it cannot operate normally, the device is forced to stop production, and the catalyst is regenerated or updated; The hydrogen dearomatization catalyst requires a certain mechanical strength and a certain amount of precious metals to be selected. The cost is relatively high, the one-time investment is relatively large, the unit product processing cost is high, and the market competitiveness is low.

However, there are many types of low-pressure hydrodearomatization reactors currently in use. The disadvantage is that the structure is too simple, the gas flow characteristics inside the reactor are not paid attention to, the reaction medium cannot be uniformly contacted with the catalyst, and the hydrofining efficiency is not high. , is not conducive to the promotion and application of

[0003] The operation method of catalyst loading is very important. It not only affects the loading amount of catalyst, but also is related to the processing capacity of the device. More importantly, if the density is uneven during the loading process, it is easy to cause the material to go "short circuit" or the bed to sink, resulting in The uneven distribution of materials and temperature, and the unequal contact time between materials and catalysts affect the quality of products and the life of catalysts

If the particle size of the ceramic ball is not matched with the particle size of the catalyst, it may cause the migration of the catalyst

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