Granule-based wax sweating method

A particle and particle size technology, which is applied in the recovery of petroleum wax, can solve the problems of low enthalpy, uneven heat transfer, and narrow melting range of phase change wax, so as to improve fluidity, increase heat transfer area, and narrow melting range Effect

Active Publication Date: 2019-05-28
上海焦耳蜡业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-efficiency sweating method based on particles to solve the problems of uneven heat transfer, low product yield, high oil content, low enthalpy of phase change wax and narrow melting range mentioned in the background technology question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 0.5 kg of petroleum wax paste with a melting point of 65°C and an oil content of 7% and heat it to melt, control the heating temperature at 78°C, then add 1 cm of acrylic particles, stir evenly, put it into a sweating dish, and control the cooling rate at 1.9°C / h. When the oil-containing wax is slowly cooled to 50°C, the paraffin wax of the sweating raw material crystallizes out as thick fibrous crystals, and the oil in the oil-containing wax and a part of the low-melting paraffin wax dissolved in the oil gradually ooze out from the crystalline raw wax paste. When the oil-containing wax was slowly reheated (heating rate 0.5° C. / hour), after the oil flowed out, the wax with a low melting point was gradually separated from the oil-containing wax. After the heating is over, the remaining high-melting point paraffin products are melted with steam, and the melted high-melting point paraffin products flow into the intermediate tank; finally, steam is used to purge the swe...

Embodiment 2

[0035] Take 1 kg of petroleum wax paste with a melting point of 51°C and an oil content of 12% and heat it to melt, control the heating temperature at 65°C, then add 6mm of polyethylene wax micropowder, stir well and put it into a sweating dish, and control the cooling rate to 4.0°C / hour , when the oil-containing wax is slowly cooled to 36 ° C, the paraffin wax of the sweating raw material crystallizes out in the form of thick fibrous crystals, and the oil in the oil-containing wax and a part of the low-melting point paraffin dissolved in the oil gradually ooze out from the crystalline raw wax paste . When the oil-containing wax is slowly reheated (heating rate 0-2° C. / hour), after the oil flows out, the wax with a low melting point is gradually separated from the oil-containing wax. Finally, a 57°C phase-change wax was obtained, with an oil content of 0.5%, an enthalpy of 210KJ / kg, and a paraffin wax yield of 18%.

Embodiment 3

[0037] Take 1 kg of petroleum wax paste with a melting point of 55°C and an oil content of 11% and heat it to melt, control the heating temperature at 75°C, then add 27 microns of polypropylene wax micropowder, stir it evenly, put it into a sweating dish, and control the cooling rate at 1.0°C / Hours, when the oily wax was slowly cooled to 41°C, the paraffin wax of the sweating raw material crystallized out as thick fibrous crystals, and the oil in the oily wax and a part of the low melting point paraffin dissolved in the oil gradually infiltrated from the crystallized raw material wax paste. out. When the oil-containing wax was slowly reheated (temperature increase rate 1°C / hour), after the oil flowed out, the wax with a low melting point was gradually separated from the oil-containing wax. Finally, a 63°C phase-change wax was obtained, with an oil content of 0.25%, an enthalpy of 213KJ / kg, and a paraffin wax yield of 19%.

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Abstract

A granule-based wax sweating method comprises the following steps: (1) filling water to the bottom part of a sweating device; (2) heating paraffin to a liquid state, adding sweating granules, and thenadding the mixture in the sweating device; (3) cooling the paraffin to be 10 to 20 DEG C lower than a melting point at the speed of 1 to 4 DEG C/h; (4) releasing the water, pumping warm water to a sweating tank, heating at the speed of 0.5 to 2 DEG C/h, and collecting the paraffin which can sweat at different melting points; (5) melting the paraffin after finishing heating, and enabling a moltenhigh-melting-point paraffin product to flow into an intermediate tank; (6) blowing residual sweating granules and the last one distillate in the sweating tank by using steam, filtering and separatingthe sweating granules and the distillate, and recycling the sweating granules. According to the granule-based wax sweating method disclosed by the invention, the compaction density of sweating raw materials is reduced, outflow of oil content and low-melting-point wax can be facilitated, the fluidity of sweating liquid is improved, and the separation effect is multiplied; meanwhile, the yield of asweating product is higher, a wax melting range is narrower, a wax product is concentrated in molecular weight, and the enthalpy value of a product is higher.

Description

technical field [0001] The invention belongs to the technical field of paraffin wax deoiling, and in particular relates to a particle-based wax sweating method. Background technique [0002] Wax is a complex mixture of wax molecules of different molecular weights with different melting points. Therefore, the method of wax sweating can separate small molecules from macromolecular waxes. For example, the separation of paraffin waxes with different melting points, the separation of Fischer-Tropsch waxes, and the separation of various special waxes can all be physically separated by sweating. Therefore, various waxes with different molecular weights and waxes with different melting points are prepared. These waxes can be widely used in plastics, rubber, papermaking, casting, fiberboard, agriculture and other fields. [0003] The oily wax and wax paste formed in the petroleum dewaxing process contain a large amount of oil and low melting point components, usually 10%-30% (weig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G73/36
Inventor 张建雨
Owner 上海焦耳蜡业有限公司
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