A kind of preparation method of defoamer used in wet-process phosphoric acid production

Abstract

The invention relates to a method for preparing a defoamer used in the production of wet-process phosphoric acid, which is characterized in that it is carried out according to the following steps: 1.1-1.3 mole parts of fatty acid, 1 mole part of polyether, and 0.1 mole of p-toluenesulfonic acid Catalyst, the reaction temperature is 110-130°C, the reaction time is 4-6 hours, and the product is the defoamer. The preparation method of the present invention is simple to operate, and compared with other defoamers, the dosage is less, and has high-efficiency, rapid and lasting defoaming effect. The defoamer prepared by the present invention has a good The defoaming effect and antifoaming effect, the defoaming rate and antifoaming rate are above 95%, it is an ideal defoaming agent in wet-process phosphoric acid, has a good application prospect, and has no effect on the next process. In particular, it has no effect on the brightness and crystallization of the granulated diammonium phosphate produced.

Description

technical field [0001] The invention relates to the field of industrial defoamers, in particular to a method for preparing a defoamer used in the production of wet-process phosphoric acid. Background technique [0002] In the production of wet-process phosphoric acid, when the content of carbonate and organic matter in phosphate rock powder is high, a large amount of CO will be produced by chemical reaction with acid 2 gas. With the intense acidolysis process, CO 2 Continuously dispersed in the reaction solution containing organic components, a stable foam layer is formed on the slurry surface, and its volume usually reaches 5% to 10% of the reaction solution volume, which has many adverse effects on the production of wet-process phosphoric acid. Firstly, it affects the dispersion and acidolysis reaction of phosphate rock powder, resulting in a decrease in production capacity; secondly, the foam layer not only reduces the utilization rate of equipment, but also makes it di...

AI Technical Summary

Problems solved by technology

[0004] At present, there are not many types of chemical defoamers used in wet-process phosphoric acid defoaming in my country, and there are few reports on the experience and effects of defoamers.