Device for continuously producing acidified oil and co-producing sodium sulfate crystal from nigre

Abstract

The invention provides a device for continuously producing an acidified oil and co-producing a sodium sulfate crystal from nigre. The device comprises a suction filtration tank, a reactor, a settlingtank, a buffer tank, a circulating oil tank, an acid liquid circulating pump, a heater, a circulating oil pump, an acidified oil tank, a raw material pump, a raw material tank, an acid preparation tank and an acid discharge pump, wherein the reactor is provided with an acid liquid feed port, a nigre feed port, an upper discharge port and a lower discharge port; the raw material tank is connected to the heater through the raw material pump; the heater is connected with the nigre feed port of the reactor; the upper discharge port of the reactor is connected to the settling tank; the lower discharge port is connected to the suction filtration tank; the self-priming buffer tank is connected with the bottom of the settling tank through a self-priming pipe and is connected to the acid liquid feed port of the reactor through the acid liquid circulating pump; the settling tank is provided with an overflow port connected to the circulating oil tank; the circulating oil tank is connected to thecirculating oil pump; the circulating oil pump is respectively connected to the heater and the acidified oil tank; the acid preparation tank and the suction filtration tank are connected to the acid discharge pump; and the acid discharge pump is connected to the acid liquid feed port of the reactor.

Description

technical field [0001] The invention generally belongs to the technical field of soapstock processing, and in particular relates to a device for producing acidified oil and by-product sodium acid crystals from soapstock. Background technique [0002] Acidified oil refers to the oil obtained by acidifying the by-product soapstock produced in oil refineries. Main use: used in cold drawing factories, steel factories, and also used in pharmaceutical factories, medical care, feed factories, brick and tile factories for demoulding (isolation). Acidified oils can be used to produce fatty acids, oleic acid, stearic acid, fatty acid methyl esters, plasticizers. [0003] The current production method of acidified oil is mainly obtained by acidifying soapstock. Soapstock is a by-product of the oil refining process, which contains neutral oil (8-27%), soap (sodium fatty acid) 30-40%, the rest is mainly water, and a small amount of free fatty acids, phospholipids and lipids And pigmen...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for continuously producing acidified oil and by-product sodium sulfate crystals from soapstock, aiming at defects such as the large amount of waste water produced by the existing soapstock preparation device and process, the inability to operate continuously, and the low conversion rate of soapstock. The device realizes the continuous recycling of acid liquid, basically produces acid-containing wastewater, obtains acidified oil with a high conversion rate and at the same time obtains sodium sulfate as a by-product, and combined with the circulation of de-acidified oil, reduces the reaction temperature of raw materials and improves Raw material reaction conversion rate

[0006] It can be seen that the device of the present invention solves the problem of discharge of acidic waste water in the process of preparing acidified oil from soapstock through the design of the acid liquid circulation unit: after the reaction raw materials are acidified in the reactor, the oily reaction product in the upper layer is discharged through the upper layer. The feed port enters the settling tank for sedimentation and stratification. Because the sulfuric acid and soapstock raw materials are continuously mixed and reacted in the reactor, the upper mixed solution contains most of the oily acidified oil and part of the aqueous acid solution. After sedimentation and stratification in the settling tank, the lower layer of aqueous acid in the settling tank is re-entered into the reactor through the acid circulation unit connected to the settling tank, thereby establishing the first acid circulation loop; this acid circulation The recycling and repeated use of the acid solution in the preparation process is solved by using the circuit, so as to finally consume the acid solution in the water phase, improve the utilization rate of the acid solution and avoid the discharge of waste acid water, and do not need to set up an acid water neutralization device and sewage treatment device, reducing the environmental pollution of the process

Images