Xylose mother liquor continuous carbonation and impurity-removal device and method therefor

Patent metadata

Field	Value
Publication number	US-2021381069-A1
Application number	US-201917288068-A
Country	US
Kind code	A1
Filing date	Dec 6, 2019
Priority date	Dec 18, 2018
Publication date	Dec 9, 2021
Grant date	—

Abstract

Related to are a device and a method for performing continuous carbonation and impurity removal for xylose mother liquor. The device includes an alkali addition unit, a continuous carbonating unit, a discharge controlling unit, a CO2 supply station, a vapor station and an after-carbonation tank, wherein the alkali addition unit is configured to add Ca(OH)2 alkaline liquid into xylose mother liquor, the continuous carbonating unit is configured to introduce CO2 supplied from the CO2 supply station into the alkali-added xylose mother liquor to perform carbonation and mixing so as to remove impurities such as colloid and pigment in xylose mother liquor, the discharge controlling unit is configured to introduce CO2 supplied from the CO2 supply station and vapor transported from the vapor station into the carbonated xylose mother liquor so as to control and stabilize a pH value of the carbonated xylose mother liquor, and the after-carbonation tank is configured to collect and temporarily store the carbonated and impurity-removed xylose mother liquor so as to prepare for a next procedure. Further, a method using the device is disclosed. According to the device and the method, the pH of xylose mother liquor is continuously regulated and stabilized and continuous feeding and discharge are performed with highly automated device so as to achieve continuous and uninterrupted production, and thus facilitate improving the production efficiency.

First claim

1 . A device for performing continuous carbonation and impurity removal for xylose mother liquor, comprising an alkali adding unit, a first-level continuous carbonating unit, a discharge controlling unit, a CO 2 supply station, a vapor station and an after-carbonation tank, wherein
the alkali adding unit is configured to add Ca(OH) 2 alkaline liquid into the xylose mother liquor, the first-level continuous carbonating unit is configured to introduce CO 2 supplied from the CO 2 supply station into the alkali-added xylose mother liquor to perform carbonation and mixing so as to remove colloid and pigment impurities in the xylose mother liquor, the discharge controlling unit is configured to introduce the CO 2 supplied from the CO 2 supply station and vapor transported from the vapor station into the carbonated xylose mother liquor so as to control and stabilize a pH value of the carbonated xylose mother liquor, and the after-carbonation tank is configured to collect and temporarily store the carbonated and impurity-removed xylose mother liquor so as to prepare for a next procedure, the discharge controlling unit comprises a discharge carbonation tank, a variable-frequency mixer, a tank temperature sensor, a tank temperature controller, a CO 2 inlet flow controller, a CO 2 inlet regulating valve, a discharge pH sensor, a discharge pH controller, a vapor regulating valve and a discharge switching valve, the discharge carbonation tank is configured to collect the carbonated xylose mother liquor transported from the first-level continuous carbonating unit, and is configured to receive the CO 2 from the CO 2 supply station that flows through the CO 2 inlet flow controller, the vapor station is configured to introduce vapor into the discharge carbonation tank through the vapor regulating valve, the after-carbonation tank is configured to store the processed xylose mother liquor flowing through the discharge switching valve, the variable-frequency mixer is configured to mix the xylose mother liquor in the discharge carbonation tank, the tank temperature sensor is configured to monitor a temperature of the discharge carbonation tank, the discharge pH sensor is configured to monitor a discharge pH value of the xylose mother liquor, the variable-frequency mixer, the tank temperature controller, the discharge pH controller and the vapor regulating valve are interlocked with each other, the tank temperature controller is configured to regulate an opening degree of the vapor regulating valve according to the discharge pH value and controls the variable-frequency mixer at the same time, the variable-frequency mixer, the CO 2 inlet flow controller, the CO 2 inlet regulating valve and the discharge pH controller are interlocked with each other, and the discharge pH controller is configured to control a flow rate of the CO 2 output by the CO 2 supply station to the discharge carbonation tank based on the discharge pH value and controls the variable-frequency mixer at the same time.

2 . The device according to claim 1 , wherein the alkali liquid adding unit comprises an alkaline liquid tank, an alkaline liquid pump, a xylose mother liquor tank, a before-carbonation tank and a first pH sensor,
the alkali liquid adding unit is configured to transport an alkaline liquid from the alkaline liquid tank to the before-carbonation tank through the alkaline liquid pump and mix the alkaline liquid with the xylose mother liquor from the xylose mother liquor tank in the before-carbonation tank, and transport the mixed xylose mother liquor into the first-level continuous carbonating unit, and the first pH sensor is configured to monitor the pH value of the alkali-added xylose mother liquor transported to the first-level continuous carbonating unit.

3 . The device according to claim 2 , wherein the first-level continuous carbonating unit comprises a first continuous carbonation tank, a first switching valve, a first CO 2 inlet regulating valve and a second pH sensor,
the first continuous carbonation tank is configured to collect the alkali-added xylose mother liquor, to receive the CO 2 from the CO 2 supply station to perform carbonation and impurity removal with the xylose mother liquor, and to transport the carbonated xylose mother liquor through the first switching valve into the discharge controlling unit, and the second pH sensor is configured to monitor a change of the pH value of the carbonated xylose mother liquor transported to the discharge controlling unit.

4 . The device according to claim 3 , further comprising a second-level continuous carbonating unit, wherein
the second-level continuous carbonating unit comprises a second continuous carbonation tank, a second switching valve, a second CO 2 inlet regulating valve and a third pH sensor, the second-level continuous carbonating unit is configured to receive the carbonated xylose mother liquor from the first-level continuous carbonating unit in the second continuous carbonation tank under the control of the second pH controller to perform second carbonation and impurity removal, to receive the CO 2 from the CO 2 supply station in the second continuous carbonation tank to perform second carbonation and mixing with the xylose mother liquor, and to transport the secondly-carbonated xylose mother liquor through the second switching valve into the discharge controlling unit, and the third pH sensor is configured to monitor a change of the pH value of the secondly-carbonated xylose mother liquor transported to the discharge controlling unit.

5 . The device according to claim 4 , wherein the first-level continuous carbonating unit further comprises a first discharge straight-through valve for enabling the carbonated xylose mother liquor in the first continuous carbonation tank to directly flow into the after-carbonation tank rather than pass through a pipeline where the second pH sensor is located when the first switching valve is opened;
the second-level continuous carbonating unit further comprises a second discharge straight-through valve for enabling the carbonated xylose mother liquor in the second continuous carbonation tank to directly flow into the after-carbonation tank rather than pass through a pipeline where the third pH sensor is located when the second switching valve is opened.

6 . The device according to claim 5 , wherein the discharge controlling unit further comprises a discharge straight-through valve for enabling the processed xylose mother liquor in the discharge carbonation tank to directly flow into the after-carbonation tank rather than pass through a pipeline where the discharge pH sensor is located when the discharge switching valve is opened.

7 . A method of performing continuous carbonation and impurity removal for xylose mother liquor by using the device for performing continuous carbonation and impurity removal for xylose mother liquor according to claim 6 , comprising the following steps:
mixing the xylose mother liquor with the added alkaline liquid in the alkali adding unit to form a mixed xylose mother liquor, transporting the mixed xylose mother liquor into at least one continuous carbonating unit to perform carbonation and to be mixed with CO 2 supplied from the CO 2 supply station so as to remove colloid and pigment impurities in the xylose mother liquor, transporting the xylose mother liquor into the discharge controlling unit to perform carbonation and mixing again with the CO 2 supplied from the CO 2 supply station and vapor transported from the vapor station to control and stabilize a pH value of the carbonated xylose mother liquor, and discharging the impurity-removed xylose mother liquor to the after-carbonation tank for temporary storage so as to prepare for a next pro

Assignees

• Zhejiang Huakang Pharmaceutical Co Ltd
• Univ Zhejiang Technology

Inventors

• Luo Jiaxing
• Luo Guowei
• Liao Chengjun
• Jiang Songtao
• Zhou Yuan
• Chen Deshui
• Liu Zhiqiang
• Zhang Xiaojian
• Zheng Yuguo
• Li Mian

Classifications

• D21C11/00

  Regeneration of pulp liquors {or effluent waste waters} · CPC title

• C13K13/002 Primary

  Xylose · CPC title