Method for recovering oil-containing waste active white clay by dichloroethane

A technology of activated clay and dichloroethane, which is applied in the field of comprehensive resource recovery, can solve the problems of internal structural damage of regenerated activated clay, low oil extraction rate, and secondary pollution of the environment, achieving low toxicity, high recovery rate, and low input costs. low effect

Inactive Publication Date: 2017-09-22
JIAOZUO CITY DIV OF RESOURCES COMPREHENSIVE UTILIZATION R & D +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of them have the problem of low extraction rate and secondary pollution during the extraction process. The acid treatment causes damage to the internal structure of the regenerated active clay, and the adsorption performance is low.
Patent CN201410523840.6 discloses a recovery process of vegetable oil waste clay. The solvents used include n-hexane, cyclohexane, mixed hexane, toluene, and xylene. secondary pollution, and the extraction rate of oil is low, it takes repeated extractions to make the oil rate of waste activated clay meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for recovering oil-containing waste activated clay by using dichloroethane, including the following steps:

[0017] 1) The oily waste activated clay is leached more than once with a solvent, and the filter residue and oily components are obtained after solid-liquid separation. The solvent is 1,1-dichloroethane;

[0018] 2) Dry the filter residue obtained in step 1) to obtain regenerated activated clay;

[0019] 3) The oily components obtained in step 1) are distilled to separate distillate and grease.

[0020] Step 1) The mass ratio of solvent to oily waste activated clay during the medium extraction is 1.5:1.

[0021] The drying temperature in step 2) is 50-70°C, and the volatiles during drying are condensed and then refluxed to step 1) for use as a solvent.

[0022] The distillation temperature in step 3) is 60-70°C, and the separated fraction is refluxed to step 1) for use as a solvent.

[0023] Step 2) The regenerated activated clay obtained is used as a grease decolor...

Embodiment 2

[0026] A method for recovering oil-containing waste activated clay by using dichloroethane, including the following steps:

[0027] 1) Use a solvent to extract oil-containing waste activated clay more than once, and obtain filter residue and oily components after solid-liquid separation. The solvent is 1,1-dichloroethane;

[0028] 2) Dry the filter residue obtained in step 1) to obtain regenerated activated clay or regenerated diatomite;

[0029] 3) The oily components obtained in step 1) are distilled to separate distillate and grease.

[0030] Step 1) The mass ratio of the solvent to the oily waste activated clay during the medium extraction is 2:1.

[0031] The drying temperature in step 2) is 50-70°C, and the volatiles during drying are condensed and then refluxed to step 1) for use as a solvent.

[0032] The distillation temperature in step 3) is 60-70°C, and the separated fraction is refluxed to step 1) for use as a solvent.

[0033] Step 2) The regenerated activated clay obtained i...

Embodiment 3

[0036] A method for recovering oil-containing waste activated clay by using dichloroethane, including the following steps:

[0037] 1) Use a solvent to extract oily waste diatomaceous earth more than once, and obtain filter residue and oily components after solid-liquid separation. The solvent is 1,1-dichloroethane;

[0038] 2) Dry the filter residue obtained in step 1) to obtain regenerated activated clay or regenerated diatomite;

[0039] 3) The oily components obtained in step 1) are distilled to separate distillate and grease.

[0040] Step 1) The mass ratio of solvent to oily waste diatomaceous earth during medium extraction is 3:1.

[0041] The drying temperature in step 2) is 50-70°C, and the volatiles during drying are condensed and then refluxed to step 1) for use as a solvent.

[0042] The distillation temperature in step 3) is 60-70°C, and the separated fraction is refluxed to step 1) for use as a solvent.

[0043] Step 2) The obtained regenerated diatomaceous earth is used as ...

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Abstract

The invention relates to a method for recovering oil-containing waste active white clay by dichloroethane. The method comprises the following steps of (1) performing more than one time of digestion on the oil-containing waste active white clay or oil-containing waste kieselguhr by a solvent; after solid-liquid separation, obtaining filter slag and oil-containing ingredients, wherein the solvent is 1,1-dichloroethane; (2) drying the filter slag obtained in the step (1) to obtain the regenerated active white clay or the regenerated kieselguhr; (3) performing distillation on the oil-containing ingredients obtained in the step (1); separating fraction and grease. When the method is used for treating the oil-containing waste active white clay, the recovery rate of the grease and the active white clay is high; the process is simple; the investment cost is low; the used 1,1-dichloroethane has low toxicity; the separation and the recovery are easy; secondary pollution cannot be caused on the environment.

Description

Technical field [0001] The invention relates to a method for recovering oil-containing waste activated clay by using dichloroethane, and belongs to the technical field of comprehensive resource recovery. Background technique [0002] Activated clay is an adsorbent made of clay as a raw material. The main component is diatomaceous earth, which can be used for decolorization of various mineral oils and vegetable oils. Activated clay loses its activity after decolorizing the oil and becomes oily waste activated clay. The decolorized waste activated clay generally adsorbs 20-50% of the grease. The waste activated clay produced in the oil refining and aluminum processing industries in my country every year is as high as one million tons. For many years, most of the waste activated clay has been buried as waste, which has caused a significant waste of resources and is extremely harmful to the environment. At present, most of the disclosed technologies for oil extraction and regenerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01J20/14C11B13/04
CPCY02W30/74B01J20/3433B01J20/3475C11B13/04
Inventor 刘长春原东林田京城马文锐聂君
Owner JIAOZUO CITY DIV OF RESOURCES COMPREHENSIVE UTILIZATION R & D
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