Technology for producing fatty alcohol polyethyleneglycol ether sulfate with low dioxane content by continuous vacuum tube type neutralization

Abstract

The invention relates to a technology for producing an anionic surfactant, in particular to the technology for preparing fatty alcohol polyethyleneglycol ether sulfate with low content of 1,4-dioxane. The invention aims at providing a vacuum neutralization technology which can be used for producing the fatty alcohol polyethyleneglycol ether sulfate with low dioxane content; and the technology is characterized by high efficiency of removing the dioxane, easy control of a system, stable operation, low energy consumption and less investment. The technical scheme comprises the following steps: A.respectively metering fatty alcohol ether sulfate out of a sulfonator, base and water, and leading the three to enter into a neutralizer for carrying out neutralization together with recyclable materials out of a vacuum tube type spray remover; B. delivering the materials after the neutralization back to the vacuum tube type spray remover by using a delivery pump, and removing the 1,4-dioxane; and one part of finished products after removal re-enter into the neutralizer for carrying out neutralization and recycling as the recyclable materials, and the other part is directly discharged as the products.

Description

technical field [0001] The invention relates to a production process of anionic surfactants, in particular to a process for preparing fatty alcohol polyoxyethylene ether sulfate with low 1,4-dioxane content. Background technique [0002] In the surfactant industry, anionic surfactants are the earliest developed, largest and most widely used products. Among them, fatty alcohol ether sulfate (AES) obtained by epoxy addition, sulfation, neutralization and other processes has excellent decontamination, emulsification, foaming, viscosity adjustment and good hard water resistance. , is a very important anionic surfactant, widely used in liquid detergents in contact with the human body, such as shampoo, shower liquid, hand sanitizer, dish detergent, laundry detergent, etc. In 2008, my country's anionic surfactant output was about 550,000 tons, and fatty alcohol ether sulfate exceeded 230,000 tons. [0003] 1,4-dioxane, also known as 1,4-dioxane or dioxane, colorless liquid, molec...

AI Technical Summary

Problems solved by technology

Its advantages are: 1. The heat and mass transfer effect of the turbulence remover is good, and the precision of production control is not high; the disadvantages are: 1. The product is cooled during the neutralization process, and it needs to be heated when it enters the remover. Increased consumption and waste; 2. A new process needs to be added, and the processing equipment needs to be adjusted after the process is removed, and the investment in equipment is relatively large

The disadvantages are: 1. Fatty alcohol polyoxyethylene ether sulfate is easy to decompose in the environment of overalkaline and peracid, which greatly improves the requirements for the measurement accuracy of equipment such as sulfuric acid ester, neutralizer, and water; 2. The requirements for equipment The material requirements are high, and it needs to be resistant to strong acids and alkalis. 3. The neutralization process takes a short time (pH value, product content is unstable), the system stability is poor, and the adjustment is difficult; 4. The amount of water evaporated during the removal process is not easy to control. Affect the flow state of the product (such as the evaporation of water is too large, the product becomes gel, which is not conducive to the removal of 1,4-dioxane and the adjustment in the later stage)

This increases the difficulty of controlling the sulfonation and neutralization process

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