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Method for continuous preparation of highly effective cement additive

A cement admixture, high-efficiency technology, applied in the field of preparation of high-efficiency cement admixture, continuous preparation of high-efficiency cement admixture, can solve the problems of inability to increase the early strength of cement, adverse environmental effects, high production costs, etc., to achieve strength improvement and reduce production costs , the effect of air content improvement

Active Publication Date: 2008-11-12
HONGBAOLI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding feature of triethanolamine (hereinafter referred to as TEA) is that it can increase the 1-day compressive strength of cement, but it does not contribute to the strength of 28 days and beyond; Or later, the strength has a higher growth, but the early strength of the cement within 1 day or 7 days cannot be increased
The production of high-efficiency cement admixtures is usually directly compounded by purchasing active raw materials such as TEA, TIPA, DEIPA, etc., and the production cost is high
The production of these active raw materials requires a complex purification process, which is not only time-consuming and labor-intensive, but also causes adverse effects on the environment.
[0003] There is no report on the method of directly preparing high-efficiency cement admixture by reacting ammonia and epoxide as raw materials

Method used

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  • Method for continuous preparation of highly effective cement additive
  • Method for continuous preparation of highly effective cement additive
  • Method for continuous preparation of highly effective cement additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 1300kg of DEIPA to the 5000L continuous reactor 1, heat up and open the external circulation pump 2, when the liquid phase temperature reaches 70°C, spray 12kg / min water flow, 8kg / min ammonia flow and 4kg / min EO stream, control reaction pressure 1.8-2.2MPa, reaction temperature 80-100℃, residence time 1.0 hour. Keep the liquid level of the stream in the continuous reactor 1 at 2000-2200L, part of the stream is continuously sent to the flash tower 3, the tower pressure is kept between 0.4-0.9MPa, the temperature is controlled at 90-110°C, and deamination is carried out. Ammonia content 2.50% in the stream after ammonia, this stream flows through tundish 5, and sampling detects, and the content that gets MEA and DEA is respectively 44.0% and 42.2%, and 7.5kg / min PO stream is by 40%, 35%, The proportion of 25% is divided into three sections, and the stream after deamination is continuously passed into static mixers 7, 9 and 11 at the same time to make them fully mixed....

Embodiment 2

[0043]Add 800kg DEIPA and 500kg EDIPA to the 5000L continuous reactor 1, heat up and open the external circulation pump 2, when the liquid phase temperature reaches 55°C, spray 10kg / min water stream and 10kg / min ammonia from the top of the continuous reactor 1 flow and 4kg / min EO flow, the reaction pressure is controlled at 1.9-2.5MPa, the reaction temperature is 65-100°C, and the reaction residence time is 1.1 hours. Keep the liquid level of the stream in the continuous reactor 1 at 2000-2200L, part of the stream is continuously sent to the flash tower 3, the pressure is kept between 0.3-0.6MPa, the temperature is controlled at 85-110°C, deamination is carried out, and the deamination is analyzed Ammonia content 3.42% in the stream after, this stream flows through tundish 5, sampling detects, and the content that gets MEA and DEA is respectively 43.9% and 42.0%, and 8kg / minPO stream is by 30%, 30%, 40% ratio Divided into three sections and continuously fed into static mixers ...

Embodiment 3

[0045] Add 1300kg EDIPA to the 5000L continuous reactor 1, heat up and open the external circulation pump 2, when the liquid phase temperature reaches 50°C, spray 8kg / min water flow, 12kg / min ammonia flow and 4kg / min EO stream, control reaction pressure 2.3-3.2MPa, reaction temperature 75-100°C, reaction residence time 2.3 hours. Keep the liquid level of the stream in the continuous reactor 1 at 2000L, and part of the stream is continuously sent to the flash tower 3. The pressure of the flash tower is kept between 0.5 and 0.7 MPa, and the temperature is controlled at 75 to 100°C for deamination and analysis. Ammonia content is 2.72% in the stream after ammonia, this stream flows through tundish 5,, sampling detects, and the content that gets MEA and DEA is respectively 48.0% and 38.1%, the 8.6kg / min PO stream is by 35%, 35% % and 30% are divided into three sections and are continuously fed into static mixers 7, 9 and 11 at the same time as the deaminated stream to make them f...

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Abstract

The invention provides a method for continuously preparing cement admixture simply and directly with low cost, taking ammonia, ethylene oxide (EO for short) and propylene oxide (PO for short) as raw materials. The method comprises the following steps that: ammonia material flow and EO material flow the mass flow ratio of which is (17-170) to 44 are sent into a flow reactor, thereby continuously forming a mixture containing monoethanol amine, diethanolameine and trolamine; the liquid level in the flow reactor is kept in the state that material flows in the flow reactor can perform extrinsic cycle spraying from the bottom to the top of the flow reactor through a recycle pump, and meanwhile a part of the material flows is sent into a flash distillation column continuously for removing the unreacted ammonia; the material flows having the ammonia removed react with PO material flow and the products are obtained continuously. The method is utilized to continuously prepare the cement admixture, the products do not need to undergo rectification separation, thereby greatly reducing the energy consumption of production and further reducing the production cost of the products.

Description

1. Technical field [0001] The invention relates to a method for preparing high-efficiency cement admixture, in particular to a method for continuously preparing high-efficiency cement admixture, belonging to the field of organic synthesis. 2. Background technology [0002] Cement admixture is an additive added in the cement grinding process, which plays a very important role in the cement grinding process. It can produce mechanical performance through physical and chemical effects, speed up the grinding speed of materials, avoid particle agglomeration, improve cement grinding fineness and cement strength; it can also reduce grinding power consumption and improve grinding efficiency. There are many varieties of cement admixtures, among which triethanolamine and / or triisopropanolamine are the raw materials of cement admixtures, and the reports are the most. The outstanding feature of triethanolamine (hereinafter referred to as TEA) is that it can increase the 1-day compressiv...

Claims

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Application Information

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IPC IPC(8): C04B24/12
Inventor 邢益辉孙华荣文春俊杭建荣李霞
Owner HONGBAOLI GRP CO LTD
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