System for preparing isopropanol through propylene hydration reaction

Abstract

The invention discloses a system for preparing isopropanol through propylene hydration reaction. The system is characterized in that areactor is communicated with a gas-liquid separator through a pipeline A, the gas-liquid separator is communicated with a dehydrating tower through a pipeline B, the gas-liquid separator is communicated with a propylene gas supply pipe through a pipeline C, the dehydrating tower is communicated with a purifying tower through a pipeline D, the dehydrating tower is communicated with a pure water supply pipe through a pipeline E, the purifying tower is communicated with a heat exchanger through a pipeline F, the pipeline G of the heat exchanger is communicated with the pipeline D through a pipeline H, the purifying tower is communicated with an extraction tank through a pipeline I, the extraction tank is connected with a pipeline J and a pipeline K, the pipeline K is communicated with the purifying tower, and each pipeline is provided with a valve. According to the structure of the system for preparing isopropanol through propylene hydration reaction, mixed gas obtained after reaction is condensed through the condenser, propylene in the mixed gas is separated, pure water in the condensed mixture is separated through the dehydrating tower, and finally isopropanol in the mixture is purified and collected through the purifying tower.

Description

technical field [0001] The invention relates to the technical field of preparing isopropanol by hydration reaction of propylene, in particular to a system for preparing isopropanol by hydration reaction of propylene. Background technique [0002] Isopropanol is an organic compound with the molecular formula C3H8O. It is an isomer of n-propanol. It is also known as dimethylmethanol and 2-propanol. It is also called IPA in the industry. It is a colorless transparent liquid, flammable, and smells like a mixture of ethanol and acetone. Soluble in water, also soluble in alcohol, ether, benzene, chloroform and most other organic solvents. Isopropanol is an important chemical product and raw material. [0003] There are generally three methods for the preparation of isopropanol: indirect hydration, direct hydration and acetone hydrogenation. Among these three methods, the direct hydration method is relatively the most environmentally friendly, and the process flow is also the si...

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Problems solved by technology

[0004] The purpose of the present invention is: to overcome the deficiencies of the prior art, to provide a system for preparing isopropanol by propylene hydration reaction, after the reaction in the reactor, the mixed gas is first condensed through a condenser, so that the mixed gas that does not participate in the reaction is condensed Propylene is separated, and then the pure water in the mixed liquid produced after condensation is separated through the dehydration tower, and finally the isopropanol in the mixture is purified and collected through the purification tower; The structural setting of the interlayer facilitates the mixing of the micron-sized propylene bubbles generated by the micro-interface generator and the pure water in the reactor to form an emulsion that first passes through the annular catalyst interlayer to produce isopropanol, and then passes through the central catalyst interlayer. When the layer is formed, the reaction produces isopropanol, thereby improving the effect of the propylene hydration reaction and increasing the yield of isopropanol; the pure water inlet branch is connected to the reactor tank, so that the gas-liquid in the reactor tank can The mixture can play the role of stirring and mixing under the action of the liquid inlet branch pipe, which improves the mixing effect of the gas-liquid mixture; through the structure of the pure water inlet branch pipe, the direct pre-mixed The gas-liquid mixture further improves the reaction efficiency of the hydration reaction of propylene gas in the reactor tank; the reactor tank forms a multi-stage mixing zone through multiple catalyst compartments, so that the propylene gas in the reactor tank has more opportunities for hydration reaction, which further improves the effect of propylene hydration reaction and increases the yield of isopropanol; the gas-liquid mixture entered by the pure water inlet branch pipe can mix the micron-sized propylene bubbles remaining in the annular catalyst compartment and it with water The emulsion is formed and taken away and mixed with the gas-liquid mixture in the mixing zone to react with the central catalyst compartment. At the same time, it is also convenient for the micro-interface generator to continue to generate more micron-sized propylene bubbles and the emulsion formed by mixing with water. React with the ring-shaped catalyst interlayer; through the purification of the multi-layer horizontal membrane structure in the tower body, the multi-layer mixed liquid can be distilled at the same time, which improves the distillation effect; through the function of the liquid guide chamber and the drip chamber, it minimizes the The influence of the liquid on the mixed liquid on the horizontal membrane when the liquid flows downward ensures the distillation effect of the mixed liquid; through the action of the liquid tank, the tank can withstand the impact of the mixed liquid flowing downward, thereby avoiding the long-term impact of the horizontal membrane The impact force affects the service life or even damages; through the action of the drain pipe extending into the body of the purification tower and the liquid inlet B in the body of the purification tower, the purified mixed liquid can affect the purification tower when it enters the body of the purification tower. The influence of the mixed liquid at the bottom of the tower body is minimal, and the mixed liquid can form a certain circulation while maintaining the height difference, further improving the distillation effect

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