3results about How to "Continuous response" patented technology

A method for producing acetone glyceryl methacrylate via transesterification involves adding methyl methacrylate and glyceryl acetone, a polymerization inhibitor tetramethylpiperidine nitroxide radical triphosphite, and a catalyst calcium acetylacetonate or zinc acetylacetonate, to an esterification reactor. The reactor is stirred and heated to 103℃-107℃ for 3-6 hours. Heating is then stopped. By controlling the reflux ratio of the reflux device at the top of the esterification reactor, the temperature inside the reactor is maintained at 121-131.5℃, and the temperature at the top of the distillation column is maintained at 92-96℃. After esterification, vacuum distillation is performed to obtain acetone glyceryl methacrylate. The advantages are: continuous reaction, simple operation, use of an organotin catalyst that does not contain heavy metal tin, and a final product yield of 94.5%-96% with a purity of over 97%, an acid value of 0.001 mg / g KOH, and a platinum-cobalt color of 5-20.

The application discloses a sampling device for water pollution detection and belongs to the technical field of sampling devices, which comprises a support frame, a first lifting plate is slidably arranged on the support frame, a support plate is fixedly connected to the first lifting plate, a reciprocating screw rod is rotatably connected to the support plate, a first sliding rod is threadedly connected to the reciprocating screw rod, a first fixed plate is fixedly connected to the first sliding rod, one end of the first fixed plate is fixedly connected to a first guide rod, the other end of the first fixed plate is fixedly connected to the outer side wall of a fixed ring, a sampling cylinder is fixedly installed in the fixed ring, and multiple groups of sampling cylinders can simultaneously perform sampling work at the same depth through cooperation of the first guide rod and the second guide rod, and multiple groups of sampling cylinders can simultaneously perform integral movement through cooperation of the reciprocating screw rod, so that the sampling cylinders can perform multiple-point sampling work in a sewage pool, and sampling efficiency and detection representativeness are improved.

This application discloses a piperazine pyrophosphate, its preparation method, and its application, belonging to the field of flame retardant technology. The preparation method of piperazine pyrophosphate in this application uses piperazine diphosphate as raw material and employs a multi-stage temperature-switching condensation reaction and a multi-stage cooling treatment to ensure complete condensation of piperazine diphosphate while avoiding side reactions. This significantly improves the synthesis efficiency, product purity, batch stability, thermal stability, and whiteness of piperazine pyrophosphate. The preparation method of piperazine pyrophosphate in this application enables continuous reaction, achieving 24-hour uninterrupted production, greatly shortening the production cycle of piperazine pyrophosphate, and reducing environmental pollution.