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A kind of microcrystalline wax deoiling method
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A technology for microcrystalline wax and deoiling, which is applied in the petroleum industry, hydrocarbon oil treatment, and petroleum wax recovery, etc., can solve the problems of high cost and low yield, and achieve the advantages of preventing system heat transfer, low solvent ratio and low cost. Effect
Active Publication Date: 2018-08-14
JIANGXI MASHAN CHEM
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Abstract
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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] Example of Primary Crystallization
[0023] Use No. 100 special wax paste, and use 0°C chilled water to cool and crystallize once. The raw material is a wax paste with high oil content extracted from vacuum residual oil, and the oil content is 10-15%. The deoiling process is to heat and melt 200g wax paste in a 1000mL flask. When the temperature reaches 70°C, it will all melt into a liquid state, add 400g MIBK (methyl isobutyl ketone) and mix well, then transfer it to a -5°C salt water tank to cool and crystallize. At this time, crystallization began to occur on the wall of the flask, the internal solution became cloudy, and the viscosity increased, and the stirring felt weak when the temperature in the flask dropped to 30°C. Add another 300g of solvent at this time, and continue to cool and crystallize to 15°C. Due to the thick layer of microcrystalline wax crystals attached to the wall of the bottle, it is difficult to continue cooling and crystallization due to dete...
Embodiment 2
[0027] Two-stage cooling crystallization test
[0028] 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 water bath at 35°C (ratio of agent to wax = 2)
[0031] (2) After cooling to 40°C, add 1.5 times more solvent, then transfer to -5°C brine bath to continue cooling and crystallization
[0032] Under the above conditions, after post-processing: filtering, washing, and evaporating the solvent, the final test results are as follows:
[0033] Raw oil content
Embodiment 3
[0035] Constant cooling, continuous drop test
[0036] With the device of embodiment 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 dropwise addition of the solvent is completed, transfer to a water bath at 15°C to continue cooling and crystallization, and add 0.8 times the solvent continuously dropwise.
[0040] (3) The dropwise addition is completed when cooling to 20°C, move to -5°C salt water tank, continue to cool and crystallize and add 0.8 times the solvent continuously dropwise.
[0041] (4) Rinse with 1 times solvent when filtering.
[0042] The test results are as follows:
[0043] Raw oil content
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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 microcrystalline wax deoiling method. Background technique [0002] The important technical step in extracting microcrystalline wax which is widely used from the heavy component or vacuum residue of petroleum refining is to separate the "wax" and "oil" in the above-mentioned raw materials. At present, the most commonly used method is to use a single or composite solvent as the medium to freeze the "wax" to crystallize and then separate and remove the solvent to realize the separation of "wax" and "oil". The classic solvent is ketone-benzene, most ketones are butanone and acetone, and benzene is benzene or toluene, a single solvent. Now there are reports of methyl isobutyl ketone, although the former has a good deoiling effect, but the use of complex solvents increases the process complexity and processing costs; although the latter simplifies the system and process, it is currently mainly in the laboratory research, Under l...
Claims
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Application Information
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