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Method for deoiling microcrystalline wax

A microcrystalline wax and deoiling technology, which is applied in the petroleum industry, hydrocarbon oil treatment, petroleum wax recovery, etc., can solve the problems of high cost and low yield, and achieve the prevention of heat transfer in the system, low solvent ratio, and simple process Effect

Active Publication Date: 2017-05-03
JIANGXI MASHAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the defects of high cost and low yield of the existing microcrystalline wax deoiling method, and provide a microcrystalline wax deoiling method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Examples of primary crystallization

[0023] The special wax paste of No. 100 is used, and the crystallization process is once cooled by 0°C chilled water. The raw material is a wax paste with high oil content initially extracted from vacuum residue, and the oil content is 10-15%. The deoiling process is to heat and melt 200g of wax paste in a 1000mL flask. When the temperature reaches 70°C, all of the wax paste is melted into a liquid state, and 400g of MIBK (methyl isobutyl ketone) is added and mixed, and then transferred to a -5°C brine tank for cooling and crystallization. At this time, crystals began to form on the wall of the flask, the internal solution became cloudy, and the viscosity increased, and when the temperature in the flask dropped to 30°C, the stirring felt weak. At this time, add 300g of solvent and continue to cool and crystallize to 15°C. Because of the thick layer of microcrystalline wax crystals attached to the bottle wall, it is difficult to con...

Embodiment 2

[0027] Two-stage cooling crystallization test

[0028] The same test device as in Example 1

[0029] The implementation conditions are changed to:

[0030] (1) The melted and diluted wax paste is cooled and crystallized in a 35°C water bath (agent-to-wax ratio = 2)

[0031] (2) After cooling to 40°C, add 1.5 times of solvent, and transfer to -5°C brine bath to continue cooling and crystallization

[0032] Under the above conditions, after post-processing: filtering, washing, and steaming out the solvent, the final detection results are as follows:

[0033] Oil content of raw materials Oil content of finished products Total agent wax ratio Finished Wax Yield Solvent consumption ratio (solvent consumption / finished product) 12.5％ 4.0％ 5.0 32％ 0.5

Embodiment 3

[0035] Constant speed cooling, continuous dripping test

[0036] The same device as in Example 1

[0037] The implementation conditions are changed to:

[0038] (1) After melting, the wax paste is diluted with 1 times the solvent, cooled and crystallized in a 40°C water bath, and continuously added dropwise with 0.8 times the solvent during the cooling process

[0039] (2) Cool to 45°C, and after the solvent is added dropwise, transfer to a 15°C water bath to continue cooling and crystallization, and continuously dropwise add 0.8 times the solvent.

[0040] (3) The dropwise addition was completed when cooled to 20°C, moved to a -5°C brine tank, continued to cool for crystallization and continuously added dropwise with 0.8 times the solvent.

[0041] (4) Rinse with 1 times solvent during filtration.

[0042] The test results are as follows:

[0043] Oil content of raw materials Oil content of finished products Total agent wax ratio Finished Wax Yield solven...

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PUM

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Abstract

The invention discloses a method for deoiling microcrystalline wax. The method comprises the following steps: (1) adding a solvent, of which the volume is one to two times that of a heavy component, residual oil or crude microcrystalline wax which is in a melted state and has the temperature of 70 DEG C to 85 DEG C, into the heavy component, residual oil or crude microcrystalline wax in a reactor through an overhead solvent tank; (2) carrying out crystallization by a method of carrying out multistage brine cooling and dropwise adding the solvent continuously from the beginning of cooling crystallization to the end of cooling crystallization, and mechanically separating the solvent after the crystallization is completed. According to the method, system heat transfer and flow state deterioration caused by rapid crystallization resulting from rapid cooling are prevented through stagewise cooling. By a continuous solvent dropwise adding method, the viscosity of a system can be constant, constant-speed cooling and constant-viscosity crystallizing are achieved, the process achieves the optimal crystallization state, and optimal wax oil separation conditions are guaranteed; the solvent-oil ratio is low, the process is simple, and the cost is low, so that the method can be extended to industrial production.

Description

technical field [0001] The invention relates to a method for deoiling microcrystalline wax. Background technique [0002] Extracting microcrystalline wax, which has a wide range of uses, from the heavy components or vacuum residues of petroleum refining, an important technical link is to separate the "wax" and "oil" in the above-mentioned raw materials. At present, the most commonly used is single or compound solvent as the medium to freeze the "wax" to crystallize and then separate the solvent to realize the separation of "wax" and "oil". The classic solvent is ketone-benzene, the ketone is mostly butanone and acetone, and the benzene is benzene or toluene, a single solvent. Now there are reports of methyl isobutyl ketone. Although the former has a good deoiling effect, the use of a composite solvent increases the complexity of the process and the processing cost; although the latter simplifies the system and process, it mainly stays in laboratory research at present. Und...

Claims

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Application Information

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IPC IPC(8): C10G73/36
CPCC10G73/36C10G2300/1081
Inventor 党渭铭党怡平顾晨海佘超王二东徐伟奇
Owner JIANGXI MASHAN CHEM