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

Abstract

The invention discloses a method for hydrogenation of medium-low temperature coal tar to produce refrigerator 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 320-350DEG 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 refrigerator oil base oil. The method provided by the invention adopts the medium-low temperature coal tar as the raw material to produce the refrigerator oil base oil with the characteristics of good low-temperature fluidity, corrosiveness, intersolubility with refrigerant and oxidation stability.

Description

technical field

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

[0002] Refrigeration machine oil is a special oil product that requires strong lubricity, low temperature fluidity, oxidation stability and high flash point. It is also required that the refrigerator oil and the refrigerant can be miscible, the product has excellent chemical stability, and can last as long as the compressor. These stringent requirements are currently only met by naphthenic oil and synthetic oil among mineral oils. Therefore, naphthenic oil has become the main raw material for the manufacture of refrigerating machine oil. The mineral oil-type refrigerating machine oils cur...

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