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Method for preparing anti-wear agent for diesel oil by removing saturated fatty acid through membrane separation

A technology of unsaturated fatty acids and fatty acids, which is applied in the direction of fatty acid preparation/refining, fatty acid production, semi-permeable membrane separation, etc., can solve the problems of low saturated fatty acid content, etc., and achieve low saturated fatty acid content, low cloud point, and excellent low temperature performance Effect

Active Publication Date: 2021-02-26
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, to provide a more thorough separation of saturated fatty acids, so that the filtrate obtained from separation under the same cooling and crystallization conditions and then formulated into diesel antiwear agents has lower Saturated fatty acid content, the cloud point is as low as close to the freezing point, a method of membrane separation and removal of saturated fatty acid to prepare diesel antiwear agent
The use of microfiltration membrane separation technology with constant pore size can solve the problem of more thorough separation of saturated fatty acids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 3600 grams of technical grade linoleic acid (saturated fatty acid content 5.0%) was put into 5 liters of crystallization kettles with jacket cooling and stirred and cooled to -8°C and maintained for 8 hours, then cooled to -8°C under the operating environment of -8°C The crystallization feed liquid is transported to the microfiltration membrane tubular separation device with a pore size of 0.5 microns through the pipeline at the bottom of the reactor, and the cooling crystal feed liquid is continuously separated by maintaining a pressure difference of 0.3 MPa, and the diesel oil anti-wear produced by the preparation of the separation liquid is obtained The saturated fatty acid mass percentage content of the agent is 0.6%, the cloud point is -16°C, and the freezing point is -17°C.

Embodiment 2

[0018] 3600 grams of technical grade linoleic acid (saturated fatty acid content 5.0%) was put into 5 liters of crystallization kettles with jacket cooling and stirred and cooled to -8°C and maintained for 8 hours, then cooled to -8°C under the operating environment of -8°C The crystallization feed liquid is transported through the pipeline at the bottom of the reactor to the microfiltration membrane tubular separation device with a pore size of 0.5 microns, and the cooling crystal feed liquid is continuously separated by maintaining a pressure difference of 0.1 MPa, and the separation liquid is prepared to obtain diesel anti-wear The saturated fatty acid mass percentage content of the agent is 0.6%, the cloud point is -16°C, and the freezing point is -17°C.

Embodiment 3

[0020] 3600 grams of technical grade linoleic acid (saturated fatty acid content 5.0%) was put into 5 liters of crystallization kettles with jacket cooling and stirred and cooled to -8°C and maintained for 8 hours, then cooled to -8°C under the operating environment of -8°C The crystallization feed liquid is transported to the microfiltration membrane tubular separation device with a pore size of 0.1 micron through the pipeline at the bottom of the reactor, and the cooled feed liquid is continuously separated by maintaining a pressure difference of 0.6 MPa to obtain the separated liquid. The mass percentage of saturated fatty acid in the grinding agent is 0.5%, the cloud point is -16°C, and the freezing point is -17°C.

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Abstract

The invention discloses a method for preparing an anti-wear agent for diesel oil by removing saturated fatty acid through membrane separation. The method comprises the following steps: cooling and crystallizing industrial unsaturated fatty acid serving as a raw material, and continuously separating the cooled and crystallized industrial unsaturated fatty acid by using a microfiltration membrane tubular device with a pore diameter of 0.1-1.0 micron under the condition that a pressure difference at the two sides of a microfiltration membrane is 0.1-0.6 MPa so as to obtain the diesel oil anti-wear agent with a lower saturated fatty acid content than a traditional diesel oil anti-wear agent product filtered by using filter cloth under the same cooling crystallization condition. The anti-wear agent prepared by the method disclosed by the invention has the lower saturated fatty acid content, the cloud point of the anti-wear agent is close to a condensation point, and the low-temperature performance of low-sulfur diesel oil is better.

Description

technical field [0001] The invention belongs to the field of refining diesel additives, and in particular relates to a method for preparing a diesel antiwear agent by membrane separation and removal of saturated fatty acids. Background technique [0002] The production of fatty acid diesel antiwear agent generally adopts unsaturated fatty acid composed of industrial grade linoleic acid, linolenic acid, oleic acid, tall oil acid and their mixtures as the main raw material, which is obtained by cooling crystallization and filtering to remove most of the saturated fatty acid. filtrate, the filtrate is formulated to obtain a diesel antiwear agent product. Industrial-grade unsaturated fatty acid products contain a certain amount of saturated fatty acid. The saturated fatty acid content in the diesel antiwear agent prepared from the separated filtrate is the main technical index affecting the performance of diesel antiwear agent. Because saturated fatty acid has a high crystalliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14C11C1/08C10L10/08C10L1/18
CPCB01D61/147C11C1/08C10L10/08C10L1/18
Inventor 董广前黄占凯张晓行王会赵迎秋赵洪张春丽
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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