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Oily sludge-based biochar as well as preparation method and application thereof

A biochar and oily sludge technology, applied in the field of soil remediation, can solve the problems of resource utilization of oily sludge and agricultural and forestry waste, and achieve the effects of strong practical value, increased oxygen content, and simple preparation process

Pending Publication Date: 2022-05-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of oily sludge-based biochar and its preparation method and application

Method used

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  • Oily sludge-based biochar as well as preparation method and application thereof
  • Oily sludge-based biochar as well as preparation method and application thereof
  • Oily sludge-based biochar as well as preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0025] The method for preparing oily sludge-based biochar provided by the invention comprises:

[0026] (1) In the presence of an activator, the solid residue obtained from the treatment of oily sludge by thermochemical cleaning and / or solvent extraction is mixed with the biomass raw material for co-pyrolysis, and the activator is a mixture of inorganic alkali and inorganic salt mixture;

[0027] (2) Washing and drying the co-pyrolysis product.

[0028] In a preferred embodiment of the present invention, the weight ratio of the solid residue to the biomass raw material is (1-5):1. Controlling the weight ratio of the solid residue to the biomass raw material can further increase the specific surface area and the like of the obtained biochar within the above-mentioned preferred implementation range.

[0029] In the present invention, the solid residue can be the solid residue obtained by treating oily sludge by various conventional thermochemical cleaning methods or solvent ex...

Embodiment approach

[0062] According to a particularly preferred embodiment of the present invention, the method comprises:

[0063] 1) drying the solid residue obtained after the oily sludge is subjected to thermochemical cleaning treatment until the water content is 1-3% by weight and the oil content is 10-15% by weight;

[0064] Wherein, the specific steps of thermochemical cleaning treatment are:

[0065] i. Take oily sludge;

[0066] ii. Take sodium silicate nonahydrate and add it to deionized water to make a chemical cleaning agent with a concentration of 7-10g / L; mix the oily sludge and chemical cleaning agent in a weight ratio of 1:9-12 to obtain mixture B ;

[0067] iii. Put mixture B in a magnetic stirrer, stir at 450-550rpm at a constant temperature of 60-70°C for 50-700min; after stirring, let it stand at room temperature for 1-5min, then centrifuge it to obtain a solid residue after removing the upper liquid.

[0068] 2) Pulverize the apricot shell to a particle size of 30-40 mesh...

Embodiment 1

[0078] 1) The oily sludge (composed of oil content 70% by weight, water content 15.8% by weight, solid content 14.2% by weight, derived from Shanghai Baishawan Oil Station) through thermochemical cleaning solid residues obtained after placing Dried in an oven at 105°C until the water content is 9% by weight and the oil content is 30% by weight;

[0079] Wherein, the specific steps of thermochemical cleaning treatment are:

[0080] i. Take 1 part by weight of oily sludge and 3 parts by weight of naphtha, and mix them to obtain mixture A1;

[0081] ii. Take an appropriate amount of cetyltrimethylammonium bromide and add it to 6 parts by weight of deionized water to prepare a chemical cleaning agent 1 with a concentration of 6 g / L. Mix mixture A1 with chemical cleaning agent 1 (2:3 parts by weight) to obtain mixture B1;

[0082] iii. The mixture B1 was placed in a magnetic stirrer, and stirred at a constant temperature of 60° C. at 400 rpm for 30 min. After the stirring was co...

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Abstract

The invention relates to the field of soil remediation, and discloses oily sludge-based biochar as well as a preparation method and application thereof. The method for preparing the oily sludge-based biochar comprises the following steps: (1) in the presence of an activating agent, mixing solid residues obtained by treating oily sludge through a thermochemical cleaning method and / or a solvent extraction method with a biomass raw material for co-pyrolysis, the activating agent being a mixture of inorganic base and inorganic salt; and (2) washing and drying a co-pyrolysis product. According to the invention, the resource utilization of the oily sludge is realized, and the environmental quality is ensured; the obtained biochar is large in specific surface area, metal or metal oxide can be loaded on the carrier, the variety and number of oxygen-containing functional groups are large, and the biochar has high practical value no matter adsorbing and solidifying heavy metal or serving as a catalytic material to oxidize organic matter.

Description

technical field [0001] The invention relates to the field of soil restoration, in particular to an oily sludge-based biochar, a preparation method and application thereof. Background technique [0002] Oily sludge is inevitably produced in the process of crude oil extraction, transportation, and processing, and the composition of oily sludge is complex and harmful. According to statistics, China's petrochemical industry produces about 3-5 million tons of oily sludge every year. Relevant laws and regulations require the harmless treatment of oily sludge. In the resource treatment technology, thermochemical cleaning and solvent extraction can recover the crude oil in the oil sludge, the operation method is simple, and it is easy to realize industrialization. However, the solid residue produced by these two technologies generally contains a certain amount of crude oil, so it cannot be discharged directly and must be treated in depth. However, there are very few studies on the...

Claims

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Application Information

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IPC IPC(8): C10B55/02B01J20/20B01J20/30B09C1/00B09C1/08C09K17/40B01J21/18B01J32/00B01J35/10
CPCC10B55/02B01J20/20B01J20/3078B01J20/28057B01J20/28061B01J20/28059B09C1/00B09C1/08C09K17/40B01J21/18B01J35/615Y02W10/40C01B32/342C01B32/324
Inventor 苗杰陆语秦冰桑军强张峰王振宇沈明欢
Owner CHINA PETROLEUM & CHEM CORP
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