External circulating slurry reactive crystallizer

Patent metadata

Field	Value
Publication number	US-11738285-B2
Application number	US-202017250238-A
Country	US
Kind code	B2
Filing date	Feb 18, 2020
Priority date	Feb 18, 2020
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

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.

First claim

What is claimed is:

1. An external circulating slurry reactive crystallizer, comprising
a riser,
a degassing zone; and
a downcomer, wherein a lower end of the riser communicates with a gas inlet pipe, a liquid inlet pipe and a solid feeding pipe, while an upper end of the riser communicates with a lower end of the degassing zone which is open at the top; an upper end of the downcomer is fixed to a sidewall of the degassing zone and the downcomer communicates with the degassing zone; wherein at least one hydrocyclone is arranged at a lower end of the downcomer and the downcomer communicates with the hydrocyclone; 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 valve is used for controlling the flow rate of the underflow port; and the overflow port communicates with the riser, thereby allowing a crystallization mother liquor containing a small-particle crystallized product to enter the riser through the overflow port.

2. The external circulating slurry reactive crystallizer of claim 1 , wherein the gas inlet pipe is arranged on a bottom surface of the riser, said gas inlet pipe and extends from the bottom surface of the riser away from the riser; the liquid inlet pipe is arranged on a sidewall of the riser and close to the gas inlet pipe, and extends from the sidewall of the riser away from the riser; and wherein the solid feeding pipe is located above the liquid inlet pipe and extends from the sidewall of the riser away from the riser and the liquid inlet pipe.

3. The external circulating slurry reactive crystallizer of claim 2 , wherein an integrated gas-liquid distributor is arranged at the bottom of the riser to disperse an incoming gas from the gas inlet pipe and an incoming liquid from the liquid inlet pipe.

4. The external circulating slurry reactive crystallizer of claim 3 , wherein a dispersion shell is arranged on the integrated gas-liquid distributor; a liquid inlet is formed in one sidewall of the dispersion shell, wherein the liquid inlet pipe communicates with the interior of the dispersion shell.

5. The external circulating slurry reactive crystallizer according to claim 1 , wherein the degassing zone comprises a transition section and an expansion section, wherein an upper end surface of the transition section comprise an inner diameter substantially equivalent to the expansion section, said expansion section comprising a hollow cylinder and said transition section comprising a hollow inverted circular truncated cone, and the riser comprises a hollow cylinder; wherein the expansion section has an inner diameter larger than that of the riser; a lower end of the transition section is fixed to and internally communicated with the upper end of the riser; a lower end surface of the transition section has an inner diameter substantially equal to an upper end surface of the riser; an upper end of the transition section is fixed to and communicates with a lower end of the expansion section; the lower end of the expansion section is higher than the upper end of the downcomer, and the upper end of the expansion section is open.

6. The external circulating slurry reactive crystallizer of claim 5 , wherein the upper end of the riser is flush with the lower end of the transition section.

7. The external circulating slurry reactive crystallizer of claim 5 , wherein the upper end of the riser extends into the degassing zone, and is positioned above the lower end of the transition.

8. The external circulating slurry reactive crystallizer of claim 1 , wherein the downcomer comprises an inclined section and a vertical section; an upper end of the inclined section is fixed to and internally communicates with the degassing zone, and a lower end of the inclined section is fixed to and internally communicates with an upper end of the vertical section; the lower end of the vertical section further communicates with the upper end of the hydrocyclone, thereby allowing slurry in the downcomer to enter the hydrocyclone through the upper end of the hydrocyclone for solid-liquid separation.

9. The external circulating slurry reactive crystallizer of claim 1 , wherein the overflow port is formed in the center of the hydrocyclone, and an overflow pipe is arranged above the overflow port; the overflow pipe extends from the overflow port away from the hydrocyclone and is communicated with the riser through a connecting pipe; and the valve is arranged above the underflow port.

10. The external circulating slurry reactive crystallizer of claim 9 , further comprising two hydrocyclones.

11. The external circulating slurry reactive crystallizer of claim 3 , further comprising a plurality of intercommunicating holes formed in the top surface of the dispersion shell, wherein the dispersion shell communicates with the riser via the intercommunicating holes; wherein an aeration needle is correspondingly arranged in each intercommunicating hole, such that a bottom end of the aeration needle is fixed to the bottom surface of the dispersion shell, and a top end of the aeration needle extends upwards through the intercommunicating hole; such that the aeration needles allow the gas inlet pipe and the riser to communicate with each other; the aeration needle having a diameter smaller than an inner diameter of the intercommunicating hole.

Assignees

• Qingdao Inst Bioenergy & Bioprocess Tech Cas
• Inst Process Eng Cas

Inventors

• Huang Qingshan
• Chen Aqiang
• Xiao Hang
• Geng Shujun
• Yang Chao

Classifications

• B01D9/004 Primary

  Fractional crystallisation; Fractionating or rectifying columns · CPC title

• B01D9/0036 Primary

  Crystallisation on to a bed of product crystals; Seeding · CPC title

• B01D9/0059

  General arrangements of crystallisation plant, e.g. flow sheets · CPC title

• B01D19/0068

  General arrangements, e.g. flowsheets (B01D19/0063 takes precedence) · CPC title

• B01D21/267

  by using a cyclone · CPC title