Method for hydrogenation of medium-low temperature coal tar to produce transformer oil base oil

Abstract

The invention discloses a method for hydrogenation of medium-low temperature coal tar to produce transformer oil base oil. The method includes: fractionating the medium-low temperature coal tar to obtain light fraction and heavy fraction, mixing the light fraction with hydrogen and leading the mixture into a hydrotreating reaction area to contact a hydrogenation protective catalyst and a hydrofining catalyst in order to undergo hydrogenation reaction; separating the hydrofining effluent, making the obtained liquid phase product enter a fractionating tower; bringing the 280-320DEG C diesel fraction obtained by fractionation into a hydro-upgrading reaction area where a hydro-upgrading catalyst containing amorphous aluminium silicon and modified Y zeolite is adopted, and performing hydro-upgrading reaction in the presence of hydrogen; subjecting the hydro-upgrading effluent into a hydrofinishing reaction area to undergo hydrofinishing reaction, and separating the hydrofinishing product to obtain the transformer oil base oil. The method provided by the invention adopts the medium-low temperature coal tar as the raw material to maximumly produce the transformer oil base oil with the advantages of high density, volume, high volume calorific value, low aromatic hydrocarbon content, and good low temperature performance.

Description

technical field

[0001] The invention relates to a production method of transformer oil base oil, in particular to a method of hydrogenation in two stages of hydrogenation treatment-hydrogenation modification / hydrogenation supplementary refining by using medium and low-temperature coal tar pretreated by raw materials A method for producing a transformer oil base oil. Background technique

[0002] Transformer oil refers to a type of transformer oil used in oil-filled electrical equipment such as transformers, reactors, transformers, bushings, and oil switches for insulation, cooling, and arc extinguishing. There are three requirements for the performance of transformer oil: ① good physical properties; ② good electrical properties; ③ good oxidation stability.

[0003] Transformer oil base oil is the raw material for the production of transformer oil. The performance of transformer oil depends to a large extent on the performance of the transformer oil base oil. Usually, para...

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