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6.
Production process
Add water in the acid tank first, and then add sulfuric acid under stirring to prepare 30% sulfuric acid
.
Sodium nitrite is made into a 40% solution with 92% ethanol
First, add 30% sulfuric acid to the acid-resistant nitrosation reactor, add diphenylamine under stirring , and heat to dissolve
.
Cool to 15°C, add 40% sodium nitrite ethanol solution while stirring
illustrate:
(1) This product has two types: solid and liquid
.
Use ethanol as a solvent to obtain a solid product (the solid product described here)
(2) The process parameters of solid products are as follows:
7.
Laboratory preparation method
In the three-necked reaction flask, first add 38g of 30% sulfuric acid, add 20.
8g of diphenylamine with stirring, and heat to dissolve
.
Cool to 15°C and add 40% sodium nitrite ethanol solution (10g 96% sodium nitrite is made into a 40% solution with 92% ethanol)
8.
Product Standard
9.
Product use
In the rubber processing industry, it is used as a scorch retarder, a vulcanization retarder (vulcanization retarder), a high-efficiency polymerization inhibitor for neoprene; it is also used as an insecticide and disinfectant; it is also an intermediate for antioxidant 4010 and dyes
.
10.
Security measures
(1) Diphenylamine used in production is highly toxic and can be absorbed through the skin and cause poisoning
.
When splashing on the human body irritates the skin and mucous membranes, it can cause blood poisoning
(2) This product is toxic, irritating to the skin, eyes and upper respiratory tract.
Long-term exposure can cause changes in blood picture and liver function
(3) This product is easy to oxidize.
