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 purcha

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

Example Embodiment

[0040] Example 1:

[0041] Add 1300kg of DEIPA to 5000L continuous reactor 1, increase the temperature and turn on the external circulation pump 2. When the liquid phase temperature reaches 70℃, spray 12kg / min water stream, 8kg / min ammonia stream and ammonia stream from the top of continuous reactor 1 4kg / min EO flow, 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 maintained at 0.4-0.9MPa, the temperature is controlled at 90-110°C, the ammonia is removed and the analysis is removed The ammonia content in the stream after ammonia is 2.50%. This stream is passed through the intermediate tank 5 and sampled and tested. The contents of MEA and DEA are 44.0% and 42.2%, respectively. The 7.5kg / min PO stream is 40%, 35%, The 25% ratio is divided into three sections and is continuousl...

Example Embodiment

[0042] Example 2:

[0043]Add 800kg DEIPA and 500kg EDIPA to 5000L continuous reactor 1, increase the temperature and turn on external circulation pump 2. When the liquid phase temperature reaches 55℃, spray 10kg / min water stream and 10kg / min ammonia from the top of continuous reactor 1 The reaction pressure is 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 maintained at 0.3-0.6MPa, the temperature is controlled at 85-110℃, and the ammonia is removed by analysis. The ammonia content in the latter stream is 3.42%. This stream is passed through the intermediate tank 5 and sampled and tested. The contents of MEA and DEA are 43.9% and 42.0% respectively. The 8kg / minPO stream is 30%, 30%, and 40%. It is divided into three sections and continuously passed into static mixers 7, 9 and 1...

Example Embodiment

[0044] Example 3:

[0045] Add 1300kg of EDIPA to 5000L continuous reactor 1, increase the temperature and turn on external circulation pump 2. When the liquid phase temperature reaches 50℃, spray 8kg / min water stream, 12kg / min ammonia stream and 4kg from the top of continuous reactor 1 / min EO stream, control the reaction pressure from 2.3 to 3.2 MPa, the reaction temperature from 75 to 100°C, and the reaction residence time for 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 maintained between 0.5 and 0.7 MPa, and the temperature is controlled at 75 to 100 ℃. The ammonia content in the stream after ammonia is 2.72%. This stream is passed through the intermediate tank 5, and sampled and tested. The contents of MEA and DEA are 48.0% and 38.1%, respectively. The content of 8.6kg / min PO is 35% and 35%. %, 30% ratio is divided into three sections a...

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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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