Method for continuously producing high-efficiency concrete grinding aid

A cement grinding aid and high-efficiency technology, which is applied in the field of continuous preparation of high-efficiency cement grinding aid and the preparation of high-efficiency cement grinding aid, can solve the problems of time-consuming and labor-intensive, high production cost, adverse environmental impact, etc., and reduce production costs. , the effect of reducing production energy consumption

Inactive Publication Date: 2008-12-03
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 grinding aids is usually directly compounded by purchasing TEA, TIPA, DE

Method used

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  • Method for continuously producing high-efficiency concrete grinding aid
  • Method for continuously producing high-efficiency concrete grinding aid
  • Method for continuously producing high-efficiency concrete grinding aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 1300kg of DEIPA to the 5000L continuous reactor 1, raise the temperature and turn on the external circulation pump 2, when the liquid phase temperature reaches 75°C, continuously spray 14kg / min water flow and 6kg / min ammonia flow from the top of the continuous reactor 1 And 4kg / min PO flow, control reaction pressure 1.8~2.5MPa, reaction temperature 65~90℃, residence time 1.5 hours. Keep the liquid level of the stream in the continuous reactor 1 at 2200-2300L, part of the stream is continuously sent to the flash tower 3, the tower pressure is kept between 0.4-0.8MPa, the temperature is 70-100°C, and the deamination is carried out. Ammonia content 2.83% in the stream, this stream flows through tundish 5, sampling detects, draws that the content of MIPA, DIPA is respectively 45.6% and 39.4%. The 3.6kg / min EO stream is divided into three sections according to the ratio of 40%, 35%, and 25%, and is continuously passed into static mixers 7, 9 and 11 at the same time as th...

Embodiment 2

[0041] 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 81°C, continuously spray 13kg / min water flow, 7kg / min ammonia from the top of the continuous reactor flow and 4kg / min PO flow, the reaction pressure is controlled to 1.7-2.3MPa, the reaction temperature is 65-100°C, and the residence time is 1.5 hours. Keep the liquid level of the stream in the continuous reactor 1 at 2000-2400L, part of the stream is continuously sent to the flash tower 3, the tower pressure is kept between 0.5-0.8MPa, the temperature is 80-110°C, deamination is carried out, and the deamination is analyzed The ammonia content in the stream after is 2.58%. This stream flows through the tundish 5 and is sampled for detection. The contents of MIPA and DIPA are 46.6% and 38.9% respectively. The 3.9kg / min EO stream is divided into three sections according to the ratio of 30%, 30%, and 40%, and is cont...

Embodiment 3

[0043] Add 1300kg of EDIPA to the 5000L continuous reactor 1, raise the temperature and turn on the external circulation pump 2, when the liquid phase temperature reaches 85°C, continuously spray 11.5kg / min water stream and 8.5kg / min ammonia from the top of the continuous reactor Flow and 4kg / minPO flow, control reaction pressure 1.7 ~ 2.3MPa, reaction temperature 75 ~ 105 ℃, residence time 2.2 hours. Keep the liquid level of the stream in the continuous reactor 1 at 2000-2300L, part of the stream is continuously sent to the flash tower 3, the tower pressure is kept between 0.6-0.9MPa, the temperature is 85-105°C, deamination is carried out, and the deamination is analyzed After the ammonia content in the stream is 3.05%, this stream flows through the tundish 5, and sampling is detected, and the content of MIPA and DIPA is 48.5% and 37.5% respectively. Divide the 4.5kg / min EO stream into three sections according to 40%, 30%, and 30%, and feed it into static mixers 7, 9 and 11 ...

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Abstract

The invention provides a method for realizing simple and direct preparing of high-efficiency cement rubber additive. The method, which has lower cost and takes ammonia, propylene oxide (PO) and ethylene oxide (EO) as raw materials, comprises the following steps that: superfluous ammonia stream and PO stream are fed into a continuous reactor so as to continuously form a mixture containing isopropanolamine, diisopropanolamine and triisopropanolamine; liquid level inside the continuous reactor is maintained to ensure that the stream in the reactor undergoes outer circulation spraying through a circulating pump from the bottom to the top of the continuous reactor, and part of the stream is continuously fed into a flash tower so as to remove unreacted ammonia; then, the stream with ammonia removed is reacted with EO stream so as to continuously generate products. The method ensures that products do not need rectification separation and greatly reduce production energy consumption, thereby reducing the production cost of products.

Description

1. Technical field [0001] The invention relates to a method for preparing high-efficiency cement grinding aids, in particular to a method for continuously preparing high-efficiency cement grinding aids, belonging to the field of organic synthesis. 2. Background technology [0002] Cement grinding aids are additives added in the cement grinding process, which play 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 grinding aids, among which triethanolamine and / or triisopropanolamine are the raw materials of cement grinding aids, and the reports are the most. The outstanding feature of triethanolamine (hereinafter referred to as TEA) is that it can increase the ...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/52
CPCC04B2103/52C04B24/122Y02P40/10
Inventor 李国华张书孔德森傅振华叶大刚
Owner HONGBAOLI GRP CO LTD
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