N-methyl pyrrolidone for liquid crystal display panel and production process thereof
A technology of methylpyrrolidone and liquid crystal panels, applied in the field of N-methylpyrrolidone for liquid crystal panels and its production process, can solve the problems of difficult operation and control, large waste of materials, low efficiency, etc. Facilitate the control effect
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Embodiment 1
[0097] A kind of production technology of N-methylpyrrolidone for liquid crystal panel, comprises the following steps:
[0098] 1. Reaction section: including two-step reaction.
[0099]The first step of amination reaction: First, inject monomethylamine and γ-butyrolactone with a molar ratio of 1.2:1 into the mixing tank respectively by the feed pump, control the stirring preheating temperature at 30°C, stir for 5 minutes, and carry out another Preheating, the preheating temperature is 120°C, and then pumped into a fixed-bed reactor filled with catalyst for amination reaction through a metering pump, the reaction temperature is 200°C, the reaction pressure is 5MPa; the liquid hourly space velocity is 0.5h -1 , to obtain N-methylpyrrolidone crude liquid, the crude liquid is discharged through the material outlet of the reactor, and the content of gamma-butyrolactone in the crude liquid discharged through the discharge port is controlled to be less than or equal to 0.01%;
[01...
Embodiment 2
[0107] A kind of production technology of N-methylpyrrolidone for liquid crystal panel, comprises the following steps:
[0108] 1. Reaction section: including two-step reaction.
[0109] The first step of amination reaction: First, inject monomethylamine and γ-butyrolactone with a molar ratio of 1.3:1 into the mixing tank respectively by the feed pump, control the stirring preheating temperature at 35°C, stir for 8 minutes, and carry out another Preheating, the preheating temperature is 160°C, and then pumped into a fixed bed reactor filled with catalyst for amination reaction through a metering pump, the reaction temperature is 230°C, the reaction pressure is 5.5MPa; the liquid hourly space velocity is 5h -1 , to obtain N-methylpyrrolidone crude liquid, the crude liquid is discharged through the material outlet of the reactor, and the content of gamma-butyrolactone in the crude liquid discharged through the discharge port is controlled to be less than or equal to 0.01%;
[0...
Embodiment 3
[0117] A kind of production technology of N-methylpyrrolidone for liquid crystal panel, comprises the following steps:
[0118] 1. Reaction section: including two-step reaction.
[0119]The first step of amination reaction: First, inject monomethylamine and γ-butyrolactone with a molar ratio of 1.5:1 into the mixing tank by the feed pump, control the stirring preheating temperature at 40°C, stir for 10 minutes, and carry out another Preheating, the preheating temperature is 200°C, and then pumped into a fixed-bed reactor filled with catalyst for amination reaction through a metering pump, the reaction temperature is 260°C, the reaction pressure is 6MPa; the liquid hourly space velocity is 10h -1 , to obtain N-methylpyrrolidone crude liquid, the crude liquid is discharged through the material outlet of the reactor, and the content of gamma-butyrolactone in the crude liquid discharged through the discharge port is controlled to be less than or equal to 0.01%;
[0120] The secon...
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