CN111359276A - Filtering method of lactic acid acidolysis solution - Google Patents
Filtering method of lactic acid acidolysis solution Download PDFInfo
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- CN111359276A CN111359276A CN202010251023.5A CN202010251023A CN111359276A CN 111359276 A CN111359276 A CN 111359276A CN 202010251023 A CN202010251023 A CN 202010251023A CN 111359276 A CN111359276 A CN 111359276A
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- filter cake
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/21—Plate and frame presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/28—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating
- B01D25/282—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying
- B01D25/284—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying by gases or by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/28—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating
- B01D25/282—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying
- B01D25/285—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying by compression using inflatable membranes
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- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
A method for filtering lactic acid acidolysis solution comprises the following steps: conveying acidolysis solution of lactic acid to each filter chamber of a vertical plate-and-frame filter press, leaving solid phase in the acidolysis solution in the filter chambers to form filter cakes, allowing liquid phase to penetrate through filter cloth and enter a filter solution tank, pumping extrusion water into an extrusion water chamber, pushing a rubber diaphragm to extrude the filter cakes by the extrusion water, and allowing residual liquid phase in the filter cakes to penetrate through the filter cloth and enter the filter solution tank; resetting the diaphragm; delivering washing water into the filter cavity, pumping extrusion water into the extrusion water cavity to extrude the filter cake, resetting the diaphragm, injecting compressed air into the filter cavity, expanding the compressed air to extrude the diaphragm and the filter cake, and blowing residual liquid phase in the filter cake into the filtrate tank until the filter cake is completely dried; after the filter cake is dried, separating the filter cloth from the plate frame, and discharging the filter cake on the filter cloth; and simultaneously washing the filter cloth by the filter cloth washing device and repeating the steps. The method has small occupied area of equipment; the lactic acid is separated thoroughly, and the yield of the lactic acid is high; the filter cake calcium sulfate has low residual acid and water content, and can be directly dehydrated and dried to produce gypsum for buildings.
Description
Technical Field
The invention relates to a method for filtering lactic acid acidolysis solution.
Background
Lactic acid (2-hydroxypropionic acid) is a compound, an organic acid which is prepared by taking corn starch as a raw material and refining the corn starch through biological fermentation, is colorless clear viscous liquid, and the aqueous solution shows an acidic reaction. Because of having good biological compatibility, the tobacco powder can be blended with mammals, can directly participate in human metabolism, has no side effect, and is widely applied to the fields of food, medicine, tobacco, cosmetics and the like. The lactic acid is mainly produced by a fermentation method and a chemical synthesis method, the fermentation method adopts natural raw materials, is a main method for producing the lactic acid, and has larger market and stronger competitiveness.
The filter cake filtered by the lactic acid hydrolysis solution is mainly calcium lactate, and after high-temperature drying and dehydration, semi-hydrated gypsum is produced and used as a building material.
At present, the lactic acid acidolysis solution filtering equipment mainly separates filter cakes from filtrate through a vacuum belt type suction filter. The main disadvantages of this method are: 1) the equipment investment is high, the power is high, and the operation energy consumption is high; 2) the separation efficiency is low, the yield of lactic acid is low, and the water content of filter residue is high; 3) the filter cake is used for preparing gypsum and needs to be further washed to generate wastewater, the water content of the filter cake is 40%, and the production cost is high; 4) the occupied area of the equipment is large, and the collection of acid mist is inconvenient; 5) materials, shower water and the like are all in an open environment, and the environment of a production area is poor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for filtering lactic acid hydrolysis solution, which has the advantages of small occupied area of equipment, thorough lactic acid separation, high lactic acid yield, low residual acid and low water in filter cakes.
In order to solve the technical problems, the invention provides a method for filtering lactic acid hydrolysis solution, which comprises the following steps:
(1) conveying acidolysis solution of lactic acid to each filter cavity of a vertical plate-and-frame filter press by a feed pump, wherein the pumping pressure is 0.1-1.0MPa, solid phase in the acidolysis solution is left in the filter cavity under the action of gravity to form a filter cake, the liquid phase penetrates through the filter cloth and enters a filtrate tank, feeding is stopped when the thickness of the formed filter cake is 25-35mm, the material of the filter cloth is polypropylene, and the air permeability of the filter cloth is 35 +/-10L/m2S, the filter pressing precision is 15 +/-2 mu m;
(2) starting a high-pressure water pump to pump extrusion water into an extrusion water cavity through the extrusion water pump, wherein the extrusion water pushes a rubber diaphragm to move downwards to extrude a filter cake, the pressure applied to the filter cake is 0.2-1.6MPa, and the residual liquid in the filter cake permeates the filter cloth and enters a filtrate tank;
(3) the high-pressure water pump is turned over, and extrusion water is recycled to reset the diaphragm;
(4) pumping washing water into a filter cavity by using a water inlet pump, wherein the pumping pressure is 0.5-1.0MPa, the washing liquid is pure water, the temperature is 70-85 ℃, the washing liquid stays for 5min, then, starting a high-pressure water pump again to pump extrusion water into an extrusion water cavity through an extrusion water pipe, the extrusion water pushes a rubber diaphragm to move downwards to extrude a filter cake, the pressure applied to the filter cake is 0.6-1.0MPa, and residual liquid in the filter cake permeates filter cloth and enters a filtrate tank;
(5) the high-pressure water pump is turned over, the squeezing water is recycled to reset the diaphragm, meanwhile, compressed air is injected into the filter cavity from the feeding pipe, the compressed air expands to squeeze the diaphragm and the filter cake to help the squeezing water to be discharged out of the squeezing water cavity, and meanwhile, residual liquid phase in the filter cake is blown into the filter liquor tank through the filter cloth until the filter cake is completely dried;
(6) after the filter cake is dried, the vertical plate frame lifting mechanism separates the filter cloth from the plate frame, and the filter cloth mechanism starts to operate to discharge the filter cake on the filter cloth; and simultaneously washing the filter cloth by the filter cloth washing device and repeating the steps.
For the sake of simplicity, the method for filtering lactic acid hydrolysis solution according to the present invention is hereinafter referred to simply as the present method.
The method has the advantages that: compared with the traditional belt type suction filter, the method has good filtering effect; the yield of the lactic acid is high; the filter cake has low residual acid and water content; and the floor area of the equipment is also reduced. In addition, the filter cake discharged by the method does not need to be washed again, and can be directly dried and dehydrated at high temperature to produce semi-hydrated gypsum which is used as a building material, so that the cost is saved.
Drawings
Fig. 1 is a schematic structural diagram of a vertical plate-and-frame filter press in the method.
Detailed Description
The first embodiment is as follows:
a method for filtering lactic acid acidolysis solution comprises the following steps, see figure 1:
(1) conveying acidolysis solution of lactic acid to each filter chamber 1 of a vertical plate-and-frame filter press by a feed pump, wherein the pumping pressure is 0.1MPa, solid phase in the acidolysis solution is left in the filter chamber 1 under the action of gravity to form a filter cake, the liquid phase penetrates through the filter cloth 3 to enter a filter solution tank 2, feeding is stopped when the thickness of the formed filter cake is 25mm, the material of the filter cloth 3 is polypropylene fiber, and the filter cloth 3 is breathableAmount of 25L/m2S, filter pressing precision 13 μm;
(2) starting a high-pressure water pump to pump extrusion water into an extrusion water cavity 4 through the extrusion water pump, wherein the extrusion water pushes a rubber diaphragm 5 to move downwards to extrude a filter cake, the pressure intensity applied to the filter cake is 0.2MPa, and residual liquid phase in the filter cake enters a filtrate tank 2 through a filter cloth 3;
(3) the high-pressure water pump is turned over, and the extrusion water is recycled to reset the diaphragm 5;
(4) pumping washing water into a filter chamber 1 by using a water inlet pump, wherein the pumping pressure is 0.5MPa, the washing liquid is pure water, the temperature is 70 ℃, the washing liquid stays for 5min, then starting a high-pressure water pump again to pump extrusion water into an extrusion water chamber 4 through an extrusion water pipe, the extrusion water pushes a rubber diaphragm 5 to move downwards to extrude a filter cake, the pressure applied to the filter cake is 0.6MPa, and residual liquid in the filter cake penetrates through a filter cloth 3 and enters a filtrate tank 2;
(5) the high-pressure water pump is turned over, the squeezing water is recycled to reset the diaphragm 5, meanwhile, compressed air is injected into the filtering cavity 1 from the feeding pipe, the compressed air expands to squeeze the diaphragm 5 and the filter cake to help the squeezing water to be discharged out of the squeezing water cavity 4, and meanwhile, the residual liquid phase in the filter cake is blown into the filter solution tank 2 through the filter cloth 3 until the filter cake is completely dried;
(6) after the filter cake is dried, the vertical plate frame lifting mechanism separates the filter cloth 3 from the plate frame, and the filter cloth 3 mechanism starts to operate to discharge the filter cake on the filter cloth 3; while the filter cloth 3 washing device washes the filter cloth 3 and repeats the above steps.
Example two:
a method for filtering lactic acid acidolysis solution comprises the following steps, see figure 1:
(1) conveying acidolysis solution of lactic acid to each filter chamber 1 of a vertical plate-and-frame filter press by a feed pump, wherein the pumping pressure is 0.5MPa, solid phase in the acidolysis solution is left in the filter chamber 1 under the action of gravity to form a filter cake, the liquid phase penetrates through the filter cloth 3 to enter a filtrate tank 2, feeding is stopped when the thickness of the formed filter cake is 30mm, the material of the filter cloth 3 is polypropylene fiber, and the air permeability of the filter cloth 3 is 35L/m2S, filter pressing precision of 15 μm;
(2) starting a high-pressure water pump to pump extrusion water into an extrusion water cavity 4 through the extrusion water pump, wherein the extrusion water pushes a rubber diaphragm 5 to move downwards to extrude a filter cake, the pressure intensity applied to the filter cake is 0.9MPa, and residual liquid phase in the filter cake enters a filtrate tank 2 through a filter cloth 3;
(3) the high-pressure water pump is turned over, and the extrusion water is recycled to reset the diaphragm 5;
(4) pumping washing water into a filter chamber 1 by using a water inlet pump, wherein the pumping pressure is 0.75MPa, the washing water component is pure water, the temperature is 77 ℃, the washing water stays for 5min, then starting a high-pressure water pump again to pump extrusion water into an extrusion water chamber 4 through an extrusion water pipe, the extrusion water pushes a rubber diaphragm 5 to move downwards to extrude a filter cake, the pressure applied to the filter cake is 0.8MPa, and residual liquid in the filter cake penetrates through a filter cloth 3 and enters a filtrate tank 2;
(5) the high-pressure water pump is turned over, the squeezing water is recycled to reset the diaphragm 5, meanwhile, compressed air is injected into the filtering cavity 1 from the feeding pipe, the compressed air expands to squeeze the diaphragm 5 and the filter cake to help the squeezing water to be discharged out of the squeezing water cavity 4, and meanwhile, the residual liquid phase in the filter cake is blown into the filter solution tank 2 through the filter cloth 3 until the filter cake is completely dried;
(6) after the filter cake is dried, the vertical plate frame lifting mechanism separates the filter cloth 3 from the plate frame, and the filter cloth 3 mechanism starts to operate to discharge the filter cake on the filter cloth 3; while the filter cloth 3 washing device washes the filter cloth 3 and repeats the above steps.
Example three:
a method for filtering lactic acid acidolysis solution comprises the following steps, see figure 1:
(1) conveying acidolysis solution of lactic acid to each filter chamber 1 of a vertical plate-and-frame filter press by a feed pump, wherein the pumping pressure is 1.0MPa, solid phase in the acidolysis solution is left in the filter chamber 1 under the action of gravity to form a filter cake, the liquid phase penetrates through the filter cloth 3 to enter a filtrate tank 2, feeding is stopped when the thickness of the formed filter cake is 35mm, the material of the filter cloth 3 is polypropylene fiber, and the air permeability of the filter cloth 3 is 45L/m2S, filter pressing precision of 17 μm;
(2) starting a high-pressure water pump to pump extrusion water into an extrusion water cavity 4 through the extrusion water pump, wherein the extrusion water pushes a rubber diaphragm 5 to move downwards to extrude a filter cake, the pressure intensity applied to the filter cake is 1.6MPa, and residual liquid phase in the filter cake enters a filtrate tank 2 through a filter cloth 3;
(3) the high-pressure water pump is turned over, and the extrusion water is recycled to reset the diaphragm 5;
(4) pumping washing water into a filter chamber 1 by using a water inlet pump, wherein the pumping pressure is 1.0MPa, the washing liquid is pure water, the temperature is 85 ℃, the washing liquid stays for 5min, then starting the high-pressure water pump again, pumping extrusion water into an extrusion water chamber 4 through an extrusion water pipe, the extrusion water pushes a rubber diaphragm 5 to move downwards to extrude a filter cake, the pressure applied to the filter cake is 1.0MPa, and residual liquid in the filter cake penetrates through a filter cloth 3 and enters a filtrate tank 2;
(5) the high-pressure water pump is turned over, the squeezing water is recycled to reset the diaphragm 5, meanwhile, compressed air is injected into the filtering cavity 1 from the feeding pipe, the compressed air expands to squeeze the diaphragm 5 and the filter cake to help the squeezing water to be discharged out of the squeezing water cavity 4, and meanwhile, the residual liquid phase in the filter cake is blown into the filter solution tank 2 through the filter cloth 3 until the filter cake is completely dried;
(6) after the filter cake is dried, the vertical plate frame lifting mechanism separates the filter cloth 3 from the plate frame, and the filter cloth 3 mechanism starts to operate to discharge the filter cake on the filter cloth 3; while the filter cloth 3 washing device washes the filter cloth 3 and repeats the above steps.
In the above embodiment, the plate-and-frame filter press is an LZB type vertical full-automatic plate-and-frame filter press manufactured by the space wawa chemical engineering limited company. According to actual measurement, the pH value of the slurry is 1.4, the concentration of the slurry is 20-30%, the liquid phase is lactic acid and water, the needle-shaped proportion of crystalline calcium sulfate in the crude lactic acid obtained by pressure filtration is 90%, the flake-shaped proportion of crystalline calcium sulfate is 10%, the water content after pressure filtration is lower than 28%, the pH value after washing is 4-5, and 5.5 ten thousand tons of calcium sulfate are correspondingly generated after 10 ten thousand tons of lactic acid are filtered.
Claims (1)
1. The method for filtering lactic acid acidolysis solution is characterized by comprising the following steps of:
(1) conveying acidolysis solution of lactic acid to each filter cavity of a vertical plate-and-frame filter press by a feed pump, wherein the pumping pressure is 0.1-1.0MPa, solid phase in the acidolysis solution is left in the filter cavity under the action of gravity to form a filter cake, the liquid phase penetrates through the filter cloth and enters a filtrate tank, feeding is stopped when the thickness of the formed filter cake is 25-35mm, the material of the filter cloth is polypropylene, and the air permeability of the filter cloth is 35 +/-10L/m2S, the filter pressing precision is 15 +/-2 mu m;
(2) starting a high-pressure water pump to pump extrusion water into an extrusion water cavity through the extrusion water pump, wherein the extrusion water pushes a rubber diaphragm to move downwards to extrude a filter cake, the pressure applied to the filter cake is 0.2-1.6MPa, and the residual liquid in the filter cake permeates the filter cloth and enters a filtrate tank;
(3) the high-pressure water pump is turned over, and extrusion water is recycled to reset the diaphragm;
(4) pumping washing water into a filter cavity by using a water inlet pump, wherein the pumping pressure is 0.5-1.0MPa, the washing liquid is pure water, the temperature is 70-85 ℃, the washing liquid stays for 5min, then, starting a high-pressure water pump again to pump extrusion water into an extrusion water cavity through an extrusion water pipe, the extrusion water pushes a rubber diaphragm to move downwards to extrude a filter cake, the pressure applied to the filter cake is 0.6-1.0MPa, and residual liquid in the filter cake permeates filter cloth and enters a filtrate tank;
(5) the high-pressure water pump is turned over, the squeezing water is recycled to reset the diaphragm, meanwhile, compressed air is injected into the filter cavity from the feeding pipe, the compressed air expands to squeeze the diaphragm and the filter cake to help the squeezing water to be discharged out of the squeezing water cavity, and meanwhile, residual liquid phase in the filter cake is blown into the filter liquor tank through the filter cloth until the filter cake is completely dried;
(6) after the filter cake is dried, the vertical plate frame lifting mechanism separates the filter cloth from the plate frame, and the filter cloth mechanism starts to operate to discharge the filter cake on the filter cloth; and simultaneously washing the filter cloth by the filter cloth washing device and repeating the steps.
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| CN202010251023.5A CN111359276A (en) | 2020-04-01 | 2020-04-01 | Filtering method of lactic acid acidolysis solution |
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| CN202010251023.5A CN111359276A (en) | 2020-04-01 | 2020-04-01 | Filtering method of lactic acid acidolysis solution |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112263860A (en) * | 2020-10-26 | 2021-01-26 | 洛阳莱茵希德特种材料有限公司 | Filter plate structure for air drying of vertical filter press and air drying method |
| CN112850703A (en) * | 2021-02-25 | 2021-05-28 | 黑龙江哈工石墨科技有限公司 | Process for purifying spherical graphite |
| CN113457210A (en) * | 2021-09-06 | 2021-10-01 | 江苏高科制药设备有限公司 | Supercritical extraction method of fruit and vegetable active substances |
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| CN112850703A (en) * | 2021-02-25 | 2021-05-28 | 黑龙江哈工石墨科技有限公司 | Process for purifying spherical graphite |
| CN113457210A (en) * | 2021-09-06 | 2021-10-01 | 江苏高科制药设备有限公司 | Supercritical extraction method of fruit and vegetable active substances |
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