A kind of preparation method of efficient polymerization olefin refrigerant
An olefin refrigerant and catalyst technology, applied in the field of high-efficiency polymerized olefin solvent preparation, can solve the problems of difficult operation, high operating cost, poor activity and the like
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[0018] Preparation of isopentane:
[0019] S1: After adding 3‰ desulfurizer to cracked carbon five raw materials, they are pumped into a buffer tank with a height of 5m. They stay in the buffer tank for 3 hours at a temperature of 38°C, and then enter the rectification device. The temperature of the rectification tower is controlled at 85°C. , the top temperature of the rectification tower is controlled at 59°C, the number of rectification trays is 45, the operating pressure of reactive distillation is 0.08MPa, the reflux ratio is 1, and the material temperature of the reflux tank is 40°C. Desulfurization products can be obtained after rectification.
[0020] S2: The desulfurization product in S1 is fully mixed with refined dicyclopentadiene and then preheated by a preheater to enter the two-stage hydrogenation reaction unit. The inlet temperature of the first-stage hydrogenation unit is controlled at 42°C, and the amount of circulating material is 8 times, pressure 1.5MPa, hy...
Embodiment 1
[0025] Catalyst preparation
[0026] 1. Preparation of nickel catalyst
[0027] Step 1: Dissolve nickel salt, iron salt, tin salt and aluminum salt in water successively to form tetrametallic salt solution, and the obtained tetrametallic salt solution and 50ml mass fraction of 15% alkaline precipitant aqueous solution are simultaneously added to 200ml pH 9 in an aqueous sodium carbonate solution; stirring while adding to obtain a co-precipitated mixed metal hydroxide precipitate, then aging at 50°C for 3 hours, finally separating, washing and drying the precipitate to obtain a metal hydroxide powder with a hydrotalcite-like structure;
[0028] Step 2: Granulate the metal hydroxide powder, calcinate in air at 400°C for 5h, then activate the pellets by calcining them in reducing gas at 300°C, and finally stabilize the activated pellets with carbon dioxide at room temperature for 24h, namely A nickel catalyst composed of four-component metal oxides can be obtained, and the conte...
Embodiment 2
[0036] Catalyst preparation
[0037] 1. Preparation of nickel catalyst
[0038] Step 1: Dissolve nickel salt, iron salt, tin salt and aluminum salt in water successively to form tetrametallic salt solution, and the obtained tetrametallic salt solution and 50ml mass fraction of 15% alkaline precipitant aqueous solution are simultaneously added to 200ml pH 9 in an aqueous sodium carbonate solution; stirring while adding to obtain a co-precipitated mixed metal hydroxide precipitate, then aging at 50°C for 3 hours, finally separating, washing and drying the precipitate to obtain a metal hydroxide powder with a hydrotalcite-like structure;
[0039]Step 2: Granulate the metal hydroxide powder, calcinate in air at 400°C for 5h, then activate the pellets by calcining them in reducing gas at 350°C, and finally stabilize the activated pellets with carbon dioxide at room temperature for 24h, namely A nickel catalyst composed of four-component metal oxides can be obtained, and the conten...
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