Brief introduction to the production of the hottes

2022-09-27
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Introduction to the production of epoxy resin by-product industrial salt 1. Introduction to the production of industrial salt:

in the production process of epoxy resin, in addition to the sensor of the electronic universal testing machine, which is not easy to destroy the epoxy resin, the epoxy resin factory will also produce sodium chloride, which will be purified through process research and equipment improvement, such as distillation, crystallization, centrifugation, drying and other steps, and remove impurities to produce powdery industrial salt, The purity (without water) of the combined sodium chloride is more than 99.7%, which meets the industrial salt standard. At the same time, it is applied to dyeing and finishing, soft water manufacturing and regeneration, water treatment and other purposes in various factories. The effect is good, and its quality is sufficient for dyeing and finishing, leather, water treatment and other related industrial purposes

II. Salt water generation:

1. The main raw material of epoxy resin is epoxy chloride. The whole process does not need complex and expensive equipment. Propane (ECH), propanediol and catalyst sodium hydroxide (NaOH) react through pre reaction tank and main reaction tank. During the reaction, C1 contained in ECH reacts with na contained in catalyst NaOH to produce sodium chloride (salt)

2. After the reaction, the liquid resin containing salt removes the residual ECH through vacuum DEH section. After the ECH is removed, the crystal salt is washed out by adding pure water in the short refining desalination section. Therefore, it has the advantage of certification and selection in the use of export products, and the liquid is separated to the brine tank for treatment by the industrial salt equipment

III. industrial salt manufacturing process: (see Annex)

industrial salt manufacturing process is mainly divided into three parts: brine pretreatment section, neutralization section, crystallization tank system

1. brine pretreatment section:

heat the brine to 100 ℃ in a single distillation tank and send it to the vacuum desolvention and profiling equipment (strengthen the connection between production and demand of 100torr and 100 ℃), remove the dissolution and profiling and part of the water contained therein, and send it to the salt pool for temporary storage. The brine concentration is 23%

neutralization section:

use 32% hydrochloric acid to neutralize the residual na0h in the brine through the neutralization tank, reduce the Pu value to 9.5 ~ 10, filter the impurities through the leaf filter, and store them in the salt pool

crystallizing tank system:

the brine first passes through the vacuum desolventizing equipment (54 ℃), and then the remaining trace dissolution and partial water are removed, stored in the crystallizing tank feeding temporary storage tank, and then the brine is gradually concentrated by using the four effect crystallizing tank. When the specific gravity reaches the set value, it is sent to the first stage push-pull centrifuge. After the crystal salt is removed, it is sent to the re washing crystallization tank, and then sent to the second stage centrifuge for dehydration after cleaning, The dehydrated finished product is sent to the dryer for drying (moisture 0.3% ↓)

the four effect crystallization tank mainly concentrates the organic matter (glycerol, alcohol) in the brine, which is sent to the waste liquid combustion furnace for treatment. By raw salt production process

China epoxy resin finishing (end)

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