Three technological factors leading to wall sticking of double glass reactor

Double glass reactor is a new type of glass reactor based on the single-layer multi-functional glass reactor, which has been improved for many years It has realized the requirements of convenient high and low temperature, rapid temperature rise and cooling experiment process It is a necessary instrument for modern laboratory, chemical industry, pharmaceutical industry and heart material synthesis Double glass reactor is widely used in petroleum, chemical industry, rubber, pesticide, dye, medicine and food The pressure vessel used to complete vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation and other technological processes often encounters the situation of sticking to the wall when using double glass reactor, mainly including the following aspects: (1) When the temperature and pressure are not stable or fluctuate too much, the process of resin polycondensation is uneven, which is easy to cause wall sticking Therefore, in production, it should be slowly pressurized and heated Generally, water vapor of about 0.15Mpa is introduced for 2-3min, and then the pressure is slowly increased and the temperature is increased The lifting speed should be 0.1-0.15mpa per minute (2) Because the sulfate content in urea is too high, when urea is added at the later stage of resin polycondensation reaction, it is equivalent to adding curing agent to make the resin quickly cross-linked into a network structure If the treatment is not timely, the resin will be solidified in the reactor Therefore, standard industrial urea raw materials should be selected in the production, so that the sulfate content in urea is limited to 0.01% (3) the reaction temperature and time of double glazing reactor When the reaction temperature is below 80 C, if ammonia chloride is used as catalyst, the pH value will not show up because of the fast reaction of ammonia chloride When the temperature rises, pH will decrease rapidly, the reaction speed will accelerate, and the condensation reaction will be too intense, resulting in the gel causing the glass reactor to stick to the wall Key words: double glass reactor, double glass reactor, low temperature constant temperature reaction bath, single glass reactor