4。3 主要生产控制点

单酯化反应釜：反应过程中控制升温速度使反应平稳进行，取样检验酯化率达97%以上并将反应终点温度控制在80℃±5℃时出料

中控调节pH：缓慢滴加3%NaOH水溶液，加完后继续搅拌0。5小时，此时若pH为中性，继续按工艺生产，否则继续加碱调节至中性。

磺化反应：将磺化反应釜内空气排出并密封反应釜。将半成品冷却至60℃后抽入磺化反应釜，搅拌并迅速加热，使釜内压力达到0。1-0。25MPa，在140℃下保温保压反应12h。 

Design Specification

1 Basis of Design This topic is mainly based on the actual production needs of a factory, hardware parameters and operational data for the general idea。

2 Principles of Design

In the production of chemical technology design, generally, technology, economy and waste management are the focus of thinking to ensure the process design。 Which mainly includes the following points:

First is about the production of technology。 By comparing the advanced nature and maneuverability, to select the program which can make the process more convenient, production continuity better, the test value of semi-finished and finished product more stable, and easily to control。

Second is about the aspects of technical and economic。 By comparing the production needs and capital budget, to choose the most efficient means of production which is including the less investment and the most return, lower energy consumption and higher energy efficiency。 In addition, for equipment selection, we usually use standard equipment, do not select a specific model to save costs。 At the same time, auxiliary equipment such as pump, we generally choice the equipment has the uniform specifications,  which also play a throttle open source effect。

Third is about the scale of operations。 Through the comprehensive consideration of raw materials and production scale, we must guarantee the quality of raw materials and the sources effectively to meet the factory's production needs and quality requirements。 After that the mainly market should be combined with the origin of raw materials, the cost of transport and other related factors。 Finally, choosing the suppliers who can bring much profits and has a reputation to cooperate with through a certain market survey to ensure the normal operation。

Fourth is about the waste management。 Through collecting the characteristics, the corresponding physical and chemical data of raw materials, semi-finished products, finished product specifications, we should find the program of three-waste treatment, determine the necessary production process, implement the corresponding production measures, and make the production safety clear。 All of that is in order to build a safe, environmentally friendly, reasonable chemical production plant。

3 Technical Introduction

3。1 Product introduction

Stearyl alcohol polyoxyethylene ether sulfosuccinate sodium ester is a kind of anionic surfactant。 It is chemical formula is C18H37O(CH2CH2O)9COCH2CH(SO3Na)COONa。 It is a colorless or transparent viscous liquid or Gel。 The density is 1。288g / cm3。 In the water, it is acidic and the pH value is in the 4。5-6。5。 It is easily soluble in water and lower alcohols, ether ketone, methyl ethyl ketone and other hydrophilic solvents, also soluble in benzene, carbon tetrachloride。 So the product is more hydrophilic than lipophilic 。

Stearyl alcohol polyoxyethylene ether sulfosuccinate sodium ester has a comparative advantage in the washing, wetting, emulsification, solubilization, dispersion, foaming performance and other aspects。 And the product has little irritation to human and more easy to biological degradation。

3。2 Product synthesis method

In summary, the synthesis of stearyl alcohol sulfosuccinate monoester sodium includes the synthesis of anhydrides and alcohols, the synthesis of alkanolamides and anhydrides。 In the reaction principle, the two are similar。 Both of them are that the acid anhydride ring and another reactant occur esterification reaction and produce maleic acid monoester。 And then it generates electrophilic addition reaction with sodium sulfite and produce the corresponding monoester sodium salt。 Nevertheless the difference is efficacy, due to the inclusion of the -CONH bond in the amide type molecule, which is similar to the peptide bond in the human skin protein。 So the amide type is better than the fatty alcohol in the water-soluble and mildness, but it is weaker in the surface tension and emulsification effect。