Bis(tert-butyldioxyisopropyl)benzene, also known as BIBP, with the molecular formula C20H34O4, is a white crystalline powder.
Bis(tert-butyldioxyisopropyl)benzene, also known as odorless DCP, can be replaced almost anywhere DCP can be used. The properties of the rubber compound, including hardness, fracture strength, elongation, tear strength, oil resistance, and aging coefficient, are basically the same when replacing DCP with Bis(tert-butyldioxyisopropyl)benzene. However, the compression deformation at high temperatures is better than DCP with Bis(tert-butyldioxyisopropyl)benzene. And the dosage is lower, with the same crosslinking effect, the addition amount is about 1/2 to 2/3 of DCP.
The main production process of Bis(tert-butyldioxyisopropyl)benzene is briefly introduced as follows (this article is the second part):
③ BIBP synthesis unit:
After weighing the refined DC, it is added to the DC/TBHP mixing tank and a certain amount of tert butyl hydrogen peroxide (TBHP) is added. After stirring and dissolving, it is pumped to the synthesis kettle. The jacket is heated to 35 ℃ with hot water, and 70% sulfuric acid is added dropwise (98% concentrated sulfuric acid is mixed with water in the acid preparation kettle to form 70% dilute sulfuric acid, which is pumped into a 70% dilute acid measuring tank) to start the reaction. The jacket is cooled with cooling water and the temperature is controlled at 35-38 ℃. After the sampling and analysis reaction is completed, it is allowed to stand and layer by layer, Pump the lower layer liquid inside the reactor into the synthesis lower layer waste acid storage tank for temporary storage. The solution containing BIBP in the upper layer is pumped into the crude BIBP water to wash the alkali washing kettle, heated with water for washing, and left to layer. The lower layer wastewater enters the oil-water separation tank, and is divided into the lower layer wastewater for sewage treatment. The upper layer liquid returns to the water to wash the alkali washing kettle for reuse. Clear water is pumped in and liquid alkali is pumped into the tank area for alkali washing, and left to layer. The lower layer liquid goes to the oil-water separation tank for further layering, and the upper layer liquid returns to the water to wash the alkali washing kettle, Lower water phase wastewater treatment; Perform another water wash according to the water washing steps, remove the wastewater from the lower water phase, and store the upper liquid in the coarse BIBP storage tank for backup.
④ BIBP crystallization and packaging unit:
Pump methanol mother liquor into the crystallization kettle from the methanol mother liquor tank, start stirring, and add crude BIBP from the crude BIBP storage tank through the pump to the kettle. Depending on the analysis status, pump fresh methanol into the methanol intermediate tank, and cool it to 15 ℃ through the jacket with frozen saline water. Crystallize for 2 hours, centrifuge and separate. The filtrate flows to the methanol mother liquor tank for reuse. If the methanol impurity content is high, it is sent to the methanol distillation kettle for distillation and recovery; The filter cake is fed into the BIBP melting tank, and the jacket is heated to 50 ℃ with hot water to melt the BIBP. If the analysis is not qualified, it is pumped into the recrystallization kettle, and fresh A is pumped into the methanol intermediate tank for recrystallization. After centrifugation and melting, it is dried (40 ℃, atmospheric pressure) and packaged until the analysis is qualified.
The previous process includes the oxidation of isopropyl benzene (DIPB) and the purification of diisopropyl alcohol (DC). Please refer to the "Production Process of Bis(tert-butyldioxyisopropyl)benzene (Part 1)" for details.https://www.kz-opchem.com/organic-peroxides/bibp-cas-25155-25-3-bis-tert.html