Solvent recycling device

Abstract

The invention discloses a solvent recycling device. The solvent recycling device comprises a condenser, a balancing tank, an absorbing tower, a condensing tower and a freezing tower, wherein an air inlet tube for feeding steam of a to-be-recycled solvent is arranged above the condenser; the condenser is used for condensing the steam of the solvent; the balancing tank communicates with the lower portion of the condenser; by the balancing tank, the remaining steam of the solvent is balanced and stabilized after being condensed by the condenser so that free gas is formed; the lower portion of theabsorbing tower communicates with the balancing tank, and is used for absorbing the solvent in the free gas; the upper portion of the condensing tower communicates with the upper portion of the absorbing tower; the condensing tower is used for primarily condensing the free gas after the solvent in the free gas is absorbed by the absorbing tower; the lower portion of the freezing tower communicates with the lower portion of the condensing tower; the freezing tower is used for secondarily condensing the free gas after the solvent in the free gas is absorbed by the absorbing tower; and condensate discharging tubes for guiding out the solvent after condensing are separately arranged on the bottoms of the condenser, the balancing tank, the absorbing tower, the condensing tower and the freezingtower. By the solvent recycling device, steam of n-hexane can be effectively condensed and recycled.

Description

technical field [0001] The invention relates to the field of chemical industry, and more specifically, relates to a solvent recovery device. Background technique [0002] The oil extraction method is a method of oil production that applies the principle of extraction, selects an organic solvent that can dissolve oil, and extracts the oil in the oil through contact with the oil (soaking or spraying). The basic process of extracting oil is to soak the oil embryo (or pre-pressed cake) in the selected solvent, then dissolve the oil in the solvent to form a mixed oil, then separate the mixed oil from the solid residue (meal), and finally The mixed oil is evaporated and stripped according to different boiling points, so that the solvent is evaporated into vapor and separated from the oil, so as to obtain oil (leaching crude oil). Among them, the solvent vapor is condensed, cooled and recovered for further use. Because the leaching method has many advantages such as high oil yiel...

AI Technical Summary

Problems solved by technology

In actual operation, due to the lack of a solvent recovery device specifically for n-hexane in the prior art, part of the vapor containing n-hexane is discharged into the atmosphere, and n-hexane has certain toxicity and accumulation, and can be absorbed from the respiratory tract and skin. When it enters the human body, it is metabolized by the liver to produce 2,5-hexanedione, which affects the human central nervous system and motor nerve cells and causes human poisoning, which greatly affects the health of the human body; in addition, n-hexane vapor can be destroyed by photochemical degradation in the atmosphere. Ozone is very easy to cause environmental pollution and damage. After years of scientific research and investigation, the US Clean Air Act in 1990 has officially listed n-hexane as one of the 189 harmful substances in air pollution.

Images