Chinese Academy of Sciences

Qingshan Huang

Chao Yang

Hang Xiao

Aqiang Chen

Shujun Geng

Fuhua Jiang

Tao Yang

Quanhong Zhu

A device and method for increasing solid holdup in a reaction crystallizer are disclosed. The device includes a discharge pipe, a clear liquid pipe, a clear liquid tank and a gas collecting pipe. A lower end of the discharge pipe is inserted into the crystallizer below the liquid level, while that of the clear liquid pipe is inserted into the clear liquid tank below the liquid level. By using the gas collecting pipe, the reaction crystallizer and the clear liquid tank are communicated all the time. When feeding, a liquid-solid mixture in the crystallizer automatically enters the discharge pipe and flows upward slowly therein, during which solid particles gradually settle down and automatically fall back into the crystallizer while the clear liquid keeps on flowing upward, enters the clear liquid pipe and thereby flows into the clear liquid tank. The clear liquid tank maintains a constant liquid level via overflowing.

Device and method for increasing solid holdup in reaction crystallizer

Disclosed is an external circulating slurry reactive crystallizer, including a riser, a degassing zone and a downcomer. A lower end of the riser is communicated with a gas inlet pipe, a liquid inlet pipe and a solid feeding pipe, while an upper end of the riser is communicated with a lower end of the degassing zone. An upper end of the downcomer is integrally fixed to a sidewall of the degassing zone. At least one hydrocyclone is arranged at a lower end of the downcomer. The hydrocyclone is provided with an overflow port at an upper end thereof and an underflow port and a valve at a lower end thereof. The overflow port is communicated with the riser. The crystallizer can simultaneously realize reaction, crystallization and separation for continuous production with low cost, regulating and controlling the particle size distribution and morphology of crystals.

External circulating slurry reactive crystallizer

The present invention discloses an external loop slurry reactor, comprising a gas-liquid integrated distributor, a riser, a degassing zone, a solid-liquid separation circulation unit, and a storage tank. When the reactor works, reactants are injected into the riser through the gas-liquid integrated distributor; the slurry mixes and flows upwards to the degassing zone at the top for gas removal, and a large number of bubbles are removed. The slurry with catalyst particles then enters a downcomer and flows downwards. The slurry flows into a first-stage hydrocyclone and a multi-stage hydrocyclone in sequence for solid-liquid separation. The diameter of the first-stage hydrocyclone is larger than that of the multi-stage hydrocyclone. The separated solid particles flow back into the riser to continue to participate in the reaction.

External loop slurry reactor

An internal loop airlift reactor (ILAR) for process intensification integrating reaction and separation includes a riser, a downcomer, a hydrocyclone, internals preventing occurrence of dead zone, a gas guide cone, vent holes, and a gas-liquid integrated distributor. The hydrocyclone is arranged at the bottom of the ILAR downcomer; the gas guide cone and the vent holes in the downcomer prevent the gas from entering the hydrocyclone; after the slurry enters the hydrocyclone, the solid-containing slurry enters the riser again from the hydrocyclone underflow, and the solid-free clean product flows out through the hydrocyclone overflow. The ILAR in the present invention has a simple structure and low cost and requires no special liquid-solid separation device. It can achieve gas-liquid-solid three-phase reaction, interphase mass transfer, and solid-liquid separation simultaneously, and is suitable for a gas-liquid-solid three-phase reaction in which the catalyst is solid particles.

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Qingdao, China

Qingshan Huang