Comparison of triethanolamine, triisopropanolamine and diethanol monoisopropanolamine
Cement is a very basic material in the construction industry and plays a very important role in the development of the national economy. However, in the cement production process, the energy consumption is high and the utilization rate is low, mainly due to the accumulation of fine powder particles during the grinding process, which causes the paste ball and the adhesive liner to reduce the grinding efficiency, so that about 80% to 90 % of the energy is consumed in the form of heat. In order to improve this situation, it is common in the industry to add a small amount of grinding aid to the grinding material to improve the grinding effect.
Rate and reduce the energy consumption of grinding.
The production process of cement grinding aids, the most important ethanolamine production method in the world and in China, mainly using the ring-opening nucleophilic reaction of ethylene oxide (EO) and ammonia (NH3), ethylene oxide.
When water or alcohol ammonia is used as a catalyst, it reacts with excess ammonia, and three active hydrogen atoms on the ammonia molecule are replaced by hydroxyethyl one by one, and MEA, DEA and TEA are successively formed, and three kinds of ethanolamine products are obtained by fractional distillation.
Triisopropanolamine (TIPA) is an anhydrous white solid with a water-white, slightly viscous liquid. Its CAS number is: 122 - 20- 3, and the molecular weight is 191. 3, molecular formula: C9H21 NO3, molecular structure: N(CH2CHOHCH2) 3. Similar to ethanolamine production, isopropanolamine is mainly produced by the reaction of propylene oxide (PO) and ammonia (NH3) to produce isopropanolamine, diisopropanolamine, and triisopropanolamine, and water is also used as a catalyst.
Diethanol isopropanolamine (DEIPA) is a colorless transparent viscous liquid with ammonia smell. CAS No. 6712 - 98 - 7, relative molecular mass 163. 21 , Molecular formula: C7H17NO3 , its chemical formula (HOCH2CH2) 2NCHCH3 (CH2OH). Diethanol monoisopropanolamine production, there can be three different methods, one is to react ammonia with EO, PO separately to synthesize DEIPA: First, NH3 and PO get a different Propanolamine (MIPA), followed by MIPA in two steps with EO; second, developed on the basis of MIPA in the market, reacting MIPA and EO to form DEIPA; third, by diethanolamine (DEA) and PO Synthetic. Because the first and second methods are step-by-step reaction, the operation control is more and the by-products are more, and the DEA raw material market is sufficient, the third process route has great advantages. TEA is already a The use of mature early strength agents, as well as research and production, has been shown to increase the intensity of d1 and d3, but the late d28 is lower than the blank, and the optimum dosage should not exceed 0.02%. TIPA study Contrary to the application, the early strength did not increase, but it can significantly increase the late strength of the cement, which can exceed 10%.
(1) TEA, TIPA and DEIPA are good cement grinding aids with good grinding aids. (2) TEA has excellent early strength improvement, but it can not even weaken the late cement strength; TIPA can not promote the early strength of cement, but can improve the strength of later strength; DEIPA has the advantages of both, for early strength And the late strength has been significantly improved. (3) Due to the prevalence of chloride salt early strength agents and triisopropanolamine compared with triethanolamine, there are many advantages in dispersibility, age enhancement, application conditions and relative costs, so the application is gradually growing. , an increasingly widespread replacement of triethanolamine. (4) Diethanol monoisopropanolamine has a strong advantage in strength of both early strength and late strength, and will replace triethanolamine and triisopropanolamine. At the same time, due to its low toxicity, DEIPA will not pollute the environment during use. It is in line with the current trend of low-carbon and environmental protection of cement grinding aids, and it is a new type of grinding aid for green environmental protection. In addition to its good compatibility with other additives, industrial applications will inevitably become more and more.