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Polycarboxylic acid water-coal-slurry additive as well as preparation method and application thereof

A coal-water slurry and polycarboxylic acid technology, applied in the field of coal-water slurry additives, can solve the problems of high cost of synthetic raw materials, difficult molecular weight of additives, and high viscosity of coal-water slurry, so as to reduce pulping viscosity and raw material costs, and benefit product molecular weight Size, the effect of suppressing the phenomenon of burst aggregation

Inactive Publication Date: 2017-04-26
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have problems such as high cost of synthetic raw materials, difficulty in adjusting the molecular weight of additives, and high viscosity of the prepared coal-water slurry.

Method used

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  • Polycarboxylic acid water-coal-slurry additive as well as preparation method and application thereof
  • Polycarboxylic acid water-coal-slurry additive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Preparation of low-rank coal hydrothermal treatment waste liquid:

[0058] (1) Inner Mongolia Autonomous Region Dongming lignite (marked as DM) was crushed and ground to make pretreated coal water slurry, the average particle diameter D50 of coal powder in the pretreated coal water slurry was 50 μm, and the concentration was 30% by weight.

[0059] (2) Preheat the pretreated coal-water slurry prepared in step (1) to 300°C, and then use a 0.1t / d (dry coal) continuous hydrothermal reaction device to hydrothermally treat it at 300°C and 8.7MPa for 1 hour.

[0060] (3) Carry out vacuum suction filtration to the water coal slurry after hydrothermal treatment obtained in step (2), filter cake is hydrothermal upgrading coal (marked as DMU); Collect filtrate (marked as FY-300), and Concentrate under vacuum at 60°C to a solid content of about 10% by weight, and seal and store for future use.

[0061] 2. Preparation of polycarboxylate coal-water slurry additive:

[0062] (4)...

Embodiment 2

[0074] 1. Preparation of low-rank coal hydrothermal treatment waste liquid:

[0075] (1) Inner Mongolia Autonomous Region Dongming lignite (marked as DM) was crushed and ground to make pretreated coal water slurry, the average particle diameter D50 of coal powder in the pretreated coal water slurry was 50 μm, and the concentration was 30% by weight.

[0076] (2) Preheat the pretreated coal-water slurry prepared in step (1) to 325°C, and then use a 0.1t / d (dry coal) continuous hydrothermal reaction device to hydrothermally treat it at 325°C and 12.4MPa for 1 hour.

[0077] (3) Carry out vacuum suction filtration to the water coal slurry after the hydrothermal treatment that obtains in step (2), collect filtrate (marked as FY-325), and under 60 ℃ vacuumize and concentrate to solid content about 10% by weight, Sealed and kept for later use.

[0078] 2. Preparation of polycarboxylate coal-water slurry additive:

[0079] (4) Polyethylene glycol (the number average molecular weigh...

Embodiment 3

[0085] 1. Preparation of low-rank coal hydrothermal treatment waste liquid:

[0086] (1) Inner Mongolia Autonomous Region Dongming lignite (marked as DM) was crushed and ground to make pretreated coal water slurry, the average particle diameter D50 of coal powder in the pretreated coal water slurry was 50 μm, and the concentration was 30% by weight.

[0087] (2) Preheat the pretreated coal-water slurry prepared in step (1) to 250°C, and then use a 0.1t / d (dry coal) continuous hydrothermal reaction device to hydrothermally treat it at 250°C and 4.0MPa for 1.5h.

[0088] (3) Carry out vacuum suction filtration to the water coal slurry after the hydrothermal treatment obtained in step (2), collect filtrate (marked as FY-250), and vacuumize and concentrate at 60 DEG C to a solid content of about 10% by weight, Sealed and kept for later use.

[0089] 2. Preparation of polycarboxylate coal-water slurry additive:

[0090] (4) Polyethylene glycol (number average molecular weight is ...

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Abstract

The invention discloses a method for preparing a polycarboxylic acid water-coal-slurry additive by using low-rank coal hydrothermal treatment waste liquid. The method comprises the following steps: (1) preparing polyethylene glycol single acetate by carrying out reaction between polyethylene glycol and acetic acid, and then adding acrylic acid and / or maleic acid for esterification to obtain a pre-reaction system; (2) dispersing the prepared pre-reaction system, sodium vinyl sulfonate and / or sodium p-styrenesulfonate and any one of acrylic acid and / or maleic acid into the low-rank coal hydrothermal treatment waste liquid, and carrying out polymerization in the presence of a chain transfer agent and an initiator; and (3) adjusting the pH value of the reaction system prepared in the step (2) to 9 to 11 so as to obtain the polycarboxylic acid water-coal-slurry additive. Compared with a domestic representative commodity additive, the additive disclosed by the invention enables the pulping concentration of low-rank coal such as lignite to be increased by 0.94 to 1.15 percent.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry additives, and in particular relates to a method for preparing a polycarboxylate coal-water slurry additive by using low-rank coal hydrothermal treatment waste liquid, a polycarboxylate coal-water slurry additive prepared by the method, and the additive used in Application in coal water slurry. Background technique [0002] Coal is one of the most important energy sources in my country at present. Although China's coal reserves are abundant, they are mainly low-rank coals with a low degree of metamorphism, and they are concentrated in Inner Mongolia, Xinjiang, and Yunnan. In particular, my country's proven reserves of lignite are about 130 billion tons, accounting for 12.69% of the total coal resources, forming a reliable raw material basis for my country's new coal-based energy and chemical industry. Coal gasification technology is the forerunner and core link to realize the transform...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/06C08F212/14C08F2/38C08G65/332C10L1/188
CPCC08F2/38C08F290/062C08G65/3322C08G2650/04C08G2650/38C10L1/1883C08F220/06
Inventor 李春启康善娇杨明顺刘卫兵齐永丽刘鑫梅长松赵月龙赵瑞同宋学平
Owner DATANG INT CHEM TECH RESINST
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