Grease high-pressure hydrolysis production method and production device by recycling sweet water

Abstract

The invention relates to a grease high-pressure hydrolysis production method and a production device by recycling sweet water, and aims to provide the method and the device to effectively reduce waste water discharge. The technical scheme is characterized in that the grease high-pressure hydrolysis production method by recycling the sweet water comprises the following steps that (1) process water and grease countercurrent meet in a hydrolysis tower; (2) fatty acid and glycerin are generated; (3) the fatty acid with small density is discharged from the top part of the hydrolysis tower, and the sweet water with large density is discharged from the bottom part of the hydrolysis tower; (4) crude glycerin is obtained, and steam becomes evaporator condensate; (5) the evaporator condensate is recycled to replenish the process water. The grease high-pressure hydrolysis production device by recycling the sweet water comprises the hydrolysis tower and a triple effect evaporator, wherein a grease inlet, a high pressure steam inlet and a process water inlet are respectively formed in the hydrolysis tower; a condenser and a condensate water collecting tank are sequentially connected between a steam outlet of the triple effect evaporator and the process water inlet of the hydrolysis tower; the triple effect evaporator is also provided with a discharge hole for discharging the crude glycerin.

Description

technical field [0001] The invention relates to the field of oil chemical production, in particular to a production method and a production device for high-pressure hydrolysis of oil by recycling sweet water to evaporate condensed water. Background technique [0002] In the field of oleochemical production, most domestic manufacturers currently use high-pressure hydrolysis of oil to produce fatty acids and glycerin. Oil and deionized water undergo countercurrent high-temperature and high-pressure hydrolysis in a hydrolysis tower to generate fatty acids and glycerin. According to statistics, there are many sets of hydrolysis devices in operation in my country, with an annual output of more than 1 million tons, and a large amount of low-concentration crude sweet water is also produced. Due to the low initial concentration of crude sweet water, generally 12% to 25%, After three-effect or four-effect evaporation and concentration to 75% or more, it enters the distillation tower f...

AI Technical Summary

Problems solved by technology

According to statistics, many sets of hydrolysis devices are currently in operation in my country, with an annual output of more than 1 million tons, and a large amount of low-concentration crude sweet water is also produced. Due to the low initial concentration of crude sweet water, generally 12% to 25%, After three-effect or four-effect evaporation and concentration to 75% or more, it enters the distillation tower for further distillation and purification to more than 99%. Among them, after three-effect or four-effect evaporation and condensation, a large amount of waste water will be generated. The waste water contains a small amount of glycerin, untreated The direct discharge of hydrolyzed oils and fatty acids will seriously pollute the environment. In order to meet the environmental protection discharge requirements, they must be treated before they can be discharged.

The COD content in wastewater is high, and the treatment is troublesome. At present, tap water is generally used to dilute it before treatment, and then discharge it after reaching the standard, and the treatment cost is relatively high.

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