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A kind of preparation method of oil shale semi-coke-based composite water-retaining agent

A technology of oil shale semi-coke and water-retaining agent, which is applied in chemical instruments and methods, fertilizer mixtures, applications, etc. It can solve the problems of small market demand and achieve the effects of fast swelling rate, low production cost and strong water retention capacity

Active Publication Date: 2021-12-31
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Oil shale semi-coke is a solid waste produced during the production of shale oil by low-temperature carbonization technology. At present, it is mainly used for clinker batching in cement plants and fuel coal blending in power plants. However, with the strengthening of environmental protection, the market demand is increasing. Small, can only be solved by stacking in the open air
However, there is no report on the use of oil shale semi-coke to prepare composite water-retaining agents.

Method used

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  • A kind of preparation method of oil shale semi-coke-based composite water-retaining agent
  • A kind of preparation method of oil shale semi-coke-based composite water-retaining agent
  • A kind of preparation method of oil shale semi-coke-based composite water-retaining agent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Add 0.8 g of chitosan into 25 mL of water to form a uniform solution; then add 1 g of semi-coke powder, stir and disperse at 300 rpm for 4 hours to obtain a uniform dispersion; dissolve 0.2 g of ammonium persulfate in 5 mL of water and add dropwise, Incubate at 80°C for 15 min, then slowly add functional monomer and cross-linking agent mixture (dissolve 1g methylene bisacrylamide in 67 g acrylic acid to form a mixed solution), polymerize at 70°C for 3 h; then place Oven-dried at 105°C for 4 hours, and crushed to 200 mesh to obtain a molded composite water retaining agent. The swelling degree of the water retaining agent in pure water is 530 g / g, and the swelling degree in 0.9% sodium chloride solution is 68 g / g.

Embodiment 2

[0029]Example 2: Dissolve 4 g of sodium carboxymethylcellulose in 15 mL of water to form a homogeneous solution; then add 28 g of semi-coke powder, stir and disperse at 1000 rpm for 1 hour to obtain a homogeneous dispersion; dissolve 2.5 g of sodium persulfate in Add 5mL water dropwise, keep warm at 60°C for 5 min, then slowly add functional monomer and crosslinking agent mixture (2.5 g methylenebisacrylamide and 13 g 2-acrylamide-2-methyl-propane Dissolve sulfonic acid in 30 mL of water to form a mixed solution), polymerize at 70°C for 3 h; then place in an oven at 105°C for 4 h, and crush to 200 mesh to obtain a shaped composite water retaining agent. The swelling degree of the water retaining agent in pure water is 520 g / g, and the swelling degree in 0.9% sodium chloride solution is 74 g / g.

Embodiment 3

[0030] Example 3: Dissolve 2.5 g of guar gum in 35 mL of water to form a homogeneous solution; then add 20 g of semi-coke and disperse at 800 rpm for 1.5 h to obtain a homogeneous dispersion; dissolve 1.5 g of azobisisobutylamidine hydrochloride dissolved in 15 mL of water and added dropwise at 80 o C for 10 min, then slowly add functional monomer and cross-linking agent mixture (dissolve 1.0 g methylenebisacrylamide in a mixture of 15 g acrylic acid and 10 g styrene), and polymerize at 80 °C 4 h; then put it in an oven at 105°C for 4 h, and crush it to 200 mesh to obtain a molded composite water retaining agent. The swelling degree of the water retaining agent in pure water is 580 g / g, and the swelling degree in 0.9% sodium chloride solution is 80 g / g.

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Abstract

The invention provides a preparation method of an oil shale semi-coke-based composite water-retaining agent, which comprises dispersing natural polymers in water to form a uniform solution, adding oil shale semi-coke powder, and dispersing for 1 to 4 hours to obtain a uniform dispersion; Add an initiator to the dispersion, keep it warm at 50-100°C for 5-15 minutes, then add functional monomers and cross-linking agents, polymerize at 50-100°C for 1-6 hours; dry and pulverize to obtain a composite water-retaining agent. The present invention uses oil shale semi-coke as an inorganic component, which can not only realize the effective reuse of waste, but also significantly reduce the production cost of the composite water-retaining agent; the prepared composite water-retaining agent has the characteristics of high water absorption rate and good salt resistance , can be widely used in water-saving agriculture and ecological restoration and other fields.

Description

technical field [0001] The invention relates to a preparation method of a composite water-retaining agent, in particular to a preparation method of an oil shale semi-coke-based composite water-retaining agent, and belongs to the technical fields of solid waste resource utilization and polymer materials. Background technique [0002] The shortage of water resources is an important factor restricting the sustainable development of agriculture in our country. Especially in northern China, the amount of water resources and arable land in arid areas account for 17% and 64% of the country, respectively, which are only 1 / 4 and 1 / 9 in the south. At the same time, the limited water resources have not been effectively utilized, and most of the water is lost by evaporation from the soil surface. In the semi-arid regions of northwest China, its amount generally accounts for 1 / 4~1 / 2 of the total water consumption of crops and 55% of the annual precipitation. %~65%. Therefore, reducing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C08F251/00C08F251/02C08F220/06C08F212/08C08F220/58C08F220/56C08F2/44C08K11/00
CPCC09K17/40C08F251/00C08F251/02C08F2/44C08K11/005C08F220/06C08F212/08C08F220/56
Inventor 王爱勤朱永峰康玉茹王文波宗莉牟斌许江
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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