CN108671572A - A kind of triple effect cross-flow vapo(u)rization system and technique being conducive to separation - Google Patents
A kind of triple effect cross-flow vapo(u)rization system and technique being conducive to separation Download PDFInfo
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- CN108671572A CN108671572A CN201810370778.XA CN201810370778A CN108671572A CN 108671572 A CN108671572 A CN 108671572A CN 201810370778 A CN201810370778 A CN 201810370778A CN 108671572 A CN108671572 A CN 108671572A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/02—Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates; Preparation of bisulfates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/26—Separation; Purification; Stabilisation; Use of additives
- C07C319/28—Separation; Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a kind of triple effect cross-flow vapo(u)rization systems and technique being conducive to separation, including 1st effective evaporator, 2nd effect evaporator and third effect evaporator, first effect upper end of evaporator is equipped with opening, and opening is equipped with cover board, the lower end of cover board is equipped with sealing mechanism, the inner vertical of 1st effective evaporator is equipped with swingle, it is rotatablely connected at the upper end of swingle and the lower end center of cover board, the lower end of swingle is fixed with fixed block, the lower end of fixed block offers circular groove, the lower section of fixed block is equipped with paddle, the upper end of paddle is clamped by clamping mechanism and circular groove, the right side wall of 1st effective evaporator is fixed with motor housing, motor housing is internally provided with motor, the output end of motor is fixed with shaft.The present invention, it is easy to operate so that methionine concentration is uniform, is conducive to the separation of methionine.
Description
Technical field
The present invention relates to triple effect cross-flow vapo(u)rization system and technology field more particularly to a kind of triple effect being conducive to separation are wrong
Flow evaporator system and technique.
Background technology
A kind of method preparing methionine includes in acid condition the Sodium L-methioninate as in the concentrated sulfuric acid and sodium methionine solution
The solution obtained after being neutralized by sulfuric acid mainly contains methionine and sodium sulphate.It can according to the dissolubility property of methionine and sodium sulphate
Know, under conditions of 32.4 DEG C to 120 DEG C, the solubility of sodium sulphate is reduced with the raising of temperature, and methionine is molten
Solution degree then increases sharply with the raising of temperature.Therefore, extraction egg ammonia is crystallized by way of gradually cooling, vacuum flashing
Acid, the method for then taking heating evaporative crystallization to methionine mother liquor recycles sodium sulphate, to reach separation methionine and sulphur
The purpose of sour sodium.
Through retrieval, Chinese patent grant number is the patent of CN102627301A, discloses a kind of triple effect cross-flow vapo(u)rization system
And technique, including 1st effective evaporator, 2nd effect evaporator and third effect evaporator, the steam (vapor) outlet of the 1st effective evaporator
It is connected to the steam inlet of 2nd effect evaporator, the steam (vapor) outlet of 2nd effect evaporator and the steam inlet of third effect evaporator connect
Logical, the material outlet of the third effect evaporator is connected to the material inlet of 1st effective evaporator, the material of 1st effective evaporator
Outlet is connected to the material inlet of 2nd effect evaporator.In above-mentioned patent is by forcing to follow due to imitating the material in evaporator
The phenomenon that even concentration of the ring to realize material, the effect is relatively poor, to influence the separating effect of methionine.
Invention content
The purpose of the present invention is to solve the material in evaporator is imitated in the prior art realized by forced circulation
The problem of the phenomenon that even concentration of material, the effect is relatively poor, separating effect to influence methionine, and a kind of profit proposed
In the triple effect cross-flow vapo(u)rization system and technique of separation.
To achieve the goals above, present invention employs following technical solutions：
A kind of triple effect cross-flow vapo(u)rization system and technique being conducive to separation, including 1st effective evaporator, 2nd effect evaporator and third
Evaporator is imitated, the first effect upper end of evaporator is equipped with opening, and opening is equipped with cover board, and the lower end of the cover board is equipped with
Sealing mechanism, the inner vertical of the 1st effective evaporator are equipped with swingle, in the upper end of the swingle and the lower end of cover board
It is rotatablely connected at the heart, the lower end of the swingle is fixed with fixed block, and the lower end of the fixed block offers circular groove, described solid
The lower section for determining block is equipped with paddle, and the upper end of the paddle is clamped by clamping mechanism and circular groove, the 1st effective evaporator
Right side wall be fixed with motor housing, the motor housing is internally provided with motor, and the output end of the motor is fixed with shaft,
Motor housing and 1st effective evaporator and the inside for extending respectively to 1st effective evaporator are run through in the one end of the shaft far from motor,
And the one end of shaft far from motor is fixed with second bevel gear, the first bevel gear and second bevel gear engagement.
Preferably, the sealing mechanism includes annular lug, and the annular lug is fixed at the lower end of cover board, described
The opening upper edge of 1st effective evaporator is opened offers annular groove, and annular groove and convex annular with the position corresponding position of annular lug
Block matches, and there are two the first screw rods by threaded hole threaded connection for the lateral wall of the annular groove, and two the first screw rods are in
It is symmetrical arranged, one end of two first screw rods passes through threaded hole and extends outwardly, and the first screw rod is located at outside annular groove
One end is fixed with bull stick, and the position corresponding position of the side wall of the annular lug and two the first screw rods offers limiting slot.
Preferably, the inner wall of the annular groove is equipped with sealant.
Preferably, the clamping mechanism includes the cavity being arranged in fixed block interior side, and cavity is internally provided with biography
Lever, one end of the drive link and the side wall of cavity are rotatablely connected, and the other end of the drive link runs through the side wall of cavity simultaneously
The front side of fixed block is extended to, the bar wall of the drive link is located at the part in cavity and is fixed with third hand tap gear, the sky
The left and right sides of chamber is rotatably connected to the second screw rod, and two the second screw rods are located in same horizontal line, two described second
The opposite one end of screw rod is fixed with the 4th bevel gear, and the third hand tap gear is engaged with two the 4th bevel gears simultaneously, and two
The bar wall of a second screw rod is threaded with mobile bar, and side wall of the cavity close to circular groove side opens up two grooves,
And two grooves are symmetrical set, two one end of the mobile bar far from two the second screw rods extend respectively in two grooves
And it laterally is fixed with kelly, two opposite one end of the kelly extend through the side wall of two grooves and extend to circular groove
Interior, the upper end of the paddle and the position corresponding position of two kellies offer multiple card slots, and multiple card slots are arranged in a ring,
Multiple card slots match with kelly.
Preferably, one end that the drive link is located at outside cavity is fixed with runner.
Preferably, the paddle is handstand U-shaped.
A kind of triple effect cross-flow technique being conducive to separation, which is characterized in that including the work in any one of claim 1-6
Skill is specially：17kg/h is contained to the metabisulfite solution of methionine（Wherein methionine content 2.44%, sodium sulphate content 18.89%）
It is passed through in the triple effect cross-flow vapo(u)rization system of the present invention and carries out heating evaporative crystallization by above-mentioned triple effect cross-flow evaporation technology, evaporate heat source
Using 0.7MPa saturated vapor 5kg/h, evaporation time is 1 hour.
The material come out to 2nd effect evaporator is analyzed, wherein sodium sulphate content 29.9%, methionine content 6.69%,
Aqueous 52.3%, remaining is impurity, it is observed that overwhelming majority crystallization is formed in 2nd effect evaporator 2；Separation of solid and liquid is obtained
Mother liquor analyzed, wherein sodium sulphate content be 19.77%, methionine content 6.3%, aqueous 63.48%, remaining is impurity；
Sedimentation separation is carried out to the material that 2nd effect evaporator comes out, wet product sodium sulphate 2kg/h is finally obtained, through analysis, wherein sulfuric acid
Sodium content is 95.86%, methionine content 0.05%, aqueous 4%, remaining is impurity.
Compared with prior art, the present invention provides a kind of triple effect cross-flow vapo(u)rization system and technique being conducive to separation, have
Following advantageous effect：
1, the triple effect cross-flow vapo(u)rization system and technique that should be conducive to separation can be with turns by the motor being arranged in motor housing
Axis is rotated, and shaft can drive second bevel gear to rotate, and second bevel gear can drive first bevel gear to rotate, Jin Erneng
Enough drive swingle rotation so that paddle stirs evenly the methionine in 1st effective evaporator so that methionine concentration is equal
It is even, convenient for methionine is detached.
2, it should turn and turn conducive to the triple effect cross-flow vapo(u)rization system and technique of separation, by the runner being arranged on drive link
Wheel can drive drive link to rotate, and drive link can drive third hand tap gear to rotate, and third hand tap gear drives two the 4th simultaneously
Branch bevel gear rotates, and then mobile bar can be driven to move so that kelly is detached from card slot, dismantles paddle convenient for staff
Cleaning.
It is not directed to part in the device to be the same as those in the prior art or can be realized by using the prior art, the present invention, behaviour
Facilitate so that methionine concentration is uniform, is conducive to the separation of methionine.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of triple effect cross-flow vapo(u)rization system and technique being conducive to separation proposed by the present invention；
Fig. 2 is a kind of structural schematic diagram of triple effect cross-flow vapo(u)rization system and technique part A being conducive to separation proposed by the present invention；
Fig. 3 is a kind of triple effect cross-flow vapo(u)rization system being conducive to separation proposed by the present invention and the structural representation inside technique fixed block
Figure.
In figure：1 1st effective evaporator, 2 2nd effect evaporators, 3 third effect evaporators, 4 cover boards, 5 swingles, 6 fixed blocks,
7 circular grooves, 8 paddles, 9 first bevel gears, 10 motor housings, 11 motors, 12 shafts, 13 second bevel gears, 14 drive links, 15 thirds
Bevel gear, 16 second screw rods, 17 the 4th bevel gears, 18 mobile bars, 19 kellies, 20 grooves, 21 annular lugs, 22 annular grooves, 23
First screw rod, 24 runners.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
In the description of the present invention, it is to be understood that, term "upper", "lower", "front", "rear", "left", "right", "top",
The orientation or positional relationship of the instructions such as "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation, with
Specific azimuth configuration and operation, therefore be not considered as limiting the invention.
Referring to Fig.1-3, a kind of triple effect cross-flow vapo(u)rization system being conducive to separation, including the effect evaporation of 1st effective evaporator 1, second
Device 2 and third effect evaporator 3 also are provided with inside 2nd effect evaporator 2 and third effect evaporator 3 and 1st effective evaporator 1 same
Paddle 8, the upper end of 1st effective evaporator 1 is equipped with opening, and opening is equipped with cover board 4, and the lower end of cover board 4 is equipped with sealing
Mechanism, sealing mechanism include annular lug 21, and annular lug 21 is fixed at the lower end of cover board 4, and 1st effective evaporator 1 is opened
Upper edge is opened at mouthful offers annular groove 22 with the position corresponding position of annular lug 21, and the inner wall of annular groove 22 exists equipped with sealant,
Increase the air-tightness of cover board 4, and annular groove 22 matches with annular lug 21, the lateral wall of annular groove 22 passes through threaded hole screw thread
There are two the first screw rods 23 for connection, and two the first screw rods 23 are symmetrical set, and one end of two the first screw rods 23 passes through screw thread
Hole simultaneously extends outwardly, and the first screw rod 23 is located at one end outside annular groove 22 and is fixed with bull stick 24, the side wall of annular lug 21
Limiting slot is offered with the position corresponding position of two the first screw rods 23, turns bull stick 24, enables to the first screw rod 23 and annular
Convex block 21 detaches, and then convenient for removing cover board 4, and the inner vertical of 1st effective evaporator 1 is equipped with swingle 5, swingle 5 it is upper
It is rotatablely connected at end and the lower end center of cover board 4, the lower end of swingle 5 is fixed with fixed block 6, and the lower end of fixed block 6 opens up
Have a circular groove 7, the lower section of fixed block 6 is equipped with paddle 8, and paddle 8 is handstand U-shaped, the upper end of paddle 8 by clamping mechanism with
Circular groove 7 is clamped, clamping mechanism includes the cavity being arranged in 6 interior side of fixed block, and cavity is internally provided with drive link 14, passes
One end of lever 14 and the side wall of cavity are rotatablely connected, and the other end of drive link 14 runs through the side wall of cavity and extends to fixed block
6 front side, drive link 14 are located at one end outside cavity and are fixed with runner 20, and the bar wall of drive link 14 is located at the portion in cavity
Divide and be fixed with third hand tap gear 15, the left and right sides of cavity is rotatably connected to the second screw rod 16, and two the second screw rods 16
In same horizontal line, two opposite one end of the second screw rod 16 are fixed with the 4th bevel gear 17, third hand tap gear 15
It is engaged simultaneously with two the 4th bevel gears 17, the bar wall of two the second screw rods 16 is threaded with mobile bar 18, and cavity is close to circle
The side wall of 7 side of slot opens up two grooves 20, and two grooves 20 are symmetrical set, and two mobile bars 18 are far from two the second spiral shells
One end of bar 16 extends respectively in two grooves 20 and laterally be fixed with kelly 19, opposite one end of two kellies 19 point
Not Guan Chuan two grooves 20 side wall and extend in circular groove 7, the upper end of paddle 8 and the position corresponding position of two kellies 19 are opened
Equipped with multiple card slots, and multiple card slots are arranged in a ring, and multiple card slots match with kelly 19, and biography can be driven by turning runner 24
Lever 14 rotates, and drive link 14 can drive third hand tap gear 15 to rotate, and third hand tap gear 15 drives two the 4th cones simultaneously
Gear 17 rotates, and then mobile bar 18 can be driven to move so that kelly 19 is detached from card slot, is convenient for staff by paddle 8
Dismounting cleaning, the right side wall of 1st effective evaporator 1 are fixed with motor housing 10, and motor housing 10 is internally provided with motor 11, motor
11 output end is fixed with shaft 12, and motor housing 10 and 1st effective evaporator 1 are run through simultaneously in the one end of shaft 12 far from motor 11
The inside of 1st effective evaporator 1 is extended respectively to, and the one end of shaft 12 far from motor 11 is fixed with second bevel gear 13, the
One bevel gear 9 and second bevel gear 13 engage.
A kind of technique being conducive in any one of triple effect cross-flow technique, including claim 1-6 of separation is specially：It will
17kg/h contains the metabisulfite solution of methionine（Wherein methionine content 2.44%, sodium sulphate content 18.89%）It is passed through the present invention
Triple effect cross-flow vapo(u)rization system in by above-mentioned triple effect cross-flow evaporation technology carry out heating evaporative crystallization, evaporation heat source uses 0.7MPa
Saturated vapor 5kg/h, evaporation time are 1 hour.
The material come out to 2nd effect evaporator 2 is analyzed, wherein sodium sulphate content 29.9%, methionine content
6.69%, aqueous 52.3%, remaining is impurity, it is observed that overwhelming majority crystallization is formed in 2nd effect evaporator 2；To solid-liquid point
It is analyzed from obtained mother liquor, wherein sodium sulphate content is 19.77%, methionine content 6.3%, aqueous 63.48%, remaining
For impurity；Sedimentation separation is carried out to the material that 2nd effect evaporator 2 comes out, finally obtains wet product sodium sulphate 2kg/h, through analyzing,
Wherein sodium sulphate content is 95.86%, methionine content 0.05%, aqueous 4%, remaining is impurity.
In the present invention, in use, by the motor 11 being arranged in motor housing 10, shaft 12 can be driven to be rotated,
Shaft 12 can drive second bevel gear 13 to rotate, and second bevel gear 13 can drive first bevel gear 9 to rotate, and then being capable of band
Dynamic swingle 5 rotates so that paddle 8 stirs evenly the methionine in 1st effective evaporator 1 so that methionine concentration is equal
Even, convenient for detaching methionine, turning runner 24 can drive drive link 14 to rotate, and drive link 14 can drive third to bore
Gear 15 rotates, and third hand tap gear 15 drives two the 4th bevel gear 17 rotations simultaneously, and then mobile bar 18 can be driven to move
It is dynamic so that kelly 19 is detached from card slot, dismantles paddle 8 convenient for staff and clears up.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of triple effect cross-flow vapo(u)rization system being conducive to separation, including 1st effective evaporator（1）, 2nd effect evaporator（2）With
Triple effect evaporator（3）, which is characterized in that the 1st effective evaporator（1）Upper end be equipped with opening, and opening is equipped with cover board
（4）, the cover board（4）Lower end be equipped with sealing mechanism, the 1st effective evaporator（1）Inner vertical be equipped with swingle（5）,
The swingle（5）Upper end and cover board（4）Lower end center at be rotatablely connected, the swingle（5）Lower end be fixed with
Fixed block（6）, the fixed block（6）Lower end offer circular groove（7）, the fixed block（6）Lower section be equipped with paddle（8）,
The paddle（8）Upper end pass through clamping mechanism and circular groove（7）Clamping, the 1st effective evaporator（1）Right side wall fix
Equipped with motor housing（10）, the motor housing（10）Be internally provided with motor（11）, the motor（11）Output end be fixed with
Shaft（12）, the shaft（12）Far from motor（11）One end run through motor housing（10）With 1st effective evaporator（1）And respectively
Extend to 1st effective evaporator（1）Inside, and shaft（12）Far from motor（11）One end be fixed with second bevel gear
（13）, the first bevel gear（9）And second bevel gear（13）Engagement.
2. a kind of triple effect cross-flow vapo(u)rization system being conducive to separation according to claim 1, which is characterized in that the sealer
Structure includes annular lug（21）, the annular lug（21）It is fixed at cover board（4）Lower end, the 1st effective evaporator
（1）Opening upper edge open and annular lug（21）Position corresponding position offer annular groove（22）, and annular groove（22）With ring
Shape convex block（21）Match, the annular groove（22）Lateral wall be threadedly coupled there are two the first screw rod by threaded hole（23）,
And two the first screw rods（23）It is symmetrical set, two first screw rods（23）One end pass through and threaded hole and extend outwardly,
And first screw rod（23）Positioned at annular groove（22）Outer one end is fixed with bull stick（24）, the annular lug（21）Side wall with
Two the first screw rods（23）Position corresponding position offer limiting slot.
3. a kind of triple effect cross-flow vapo(u)rization system being conducive to separation according to claim 2, which is characterized in that the annular groove
（22）Inner wall be equipped with sealant.
4. a kind of triple effect cross-flow vapo(u)rization system being conducive to separation according to claim 1, which is characterized in that the clamping machine
Structure includes being arranged in fixed block（6）The cavity of interior side, and cavity is internally provided with drive link（14）, the drive link（14）
One end and cavity side wall be rotatablely connected, the drive link（14）The other end through cavity side wall and extend to fixed block
（6）Front side, the drive link（14）The part that is located in cavity of bar wall be fixed with third hand tap gear（15）, the cavity
The left and right sides be rotatably connected to the second screw rod（16）, and two the second screw rods（16）In same horizontal line, two institutes
State the second screw rod（16）Opposite one end is fixed with the 4th bevel gear（17）, the third hand tap gear（15）Simultaneously with two
4th bevel gear（17）Engagement, two second screw rods（16）Bar wall be threaded with mobile bar（18）, the cavity leans on
Nearly circular groove（7）The side wall of side opens up two grooves（20）, and two grooves（20）It is symmetrical set, two mobile bars
（18）Far from two the second screw rods（16）One end extend respectively to two grooves（20）It is interior and laterally be fixed with kelly
（19）, two kellies（19）Opposite one end extends through two grooves（20）Side wall and extend to circular groove（7）It is interior, institute
State paddle（8）Upper end and two kellies（19）Position corresponding position offer multiple card slots, and multiple card slots are set in a ring
It sets, multiple card slots and kelly（19）Match.
5. a kind of triple effect cross-flow vapo(u)rization system being conducive to separation according to claim 1, which is characterized in that the drive link
（14）One end outside cavity is fixed with runner（20）.
6. a kind of triple effect cross-flow vapo(u)rization system being conducive to separation according to claim 5, which is characterized in that the paddle
（8）For handstand U-shaped.
7. a kind of triple effect cross-flow technique being conducive to separation, which is characterized in that including the technique in any one of claim 1-6
Specially：17kg/h is contained to the metabisulfite solution of methionine（Wherein methionine content 2.44%, sodium sulphate content 18.89%）It is logical
Enter in the triple effect cross-flow vapo(u)rization system of the present invention and carry out heating evaporative crystallization by above-mentioned triple effect cross-flow evaporation technology, evaporation heat source makes
With 0.7MPa saturated vapor 5kg/h, evaporation time is 1 hour.
8. the material that pair 2nd effect evaporator 2 comes out is analyzed, wherein sodium sulphate content 29.9%, methionine content 6.69%,
Aqueous 52.3%, remaining is impurity, it is observed that overwhelming majority crystallization is in 2nd effect evaporator（2）Interior formation；To being separated by solid-liquid separation
To mother liquor analyzed, wherein sodium sulphate content is 19.77%, methionine content 6.3%, aqueous 63.48%, remaining is miscellaneous
Matter；To 2nd effect evaporator（2）Material out carries out sedimentation separation, finally obtains wet product sodium sulphate 2kg/h, through analyzing,
Middle sodium sulphate content is 95.86%, methionine content 0.05%, aqueous 4%, remaining is impurity.
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| CN201810370778.XA CN108671572A (en) | 2018-04-24 | 2018-04-24 | A kind of triple effect cross-flow vapo(u)rization system and technique being conducive to separation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111535917A (en) * | 2020-05-09 | 2020-08-14 | 安徽春辉仪表线缆集团有限公司 | Thermometer type thermostat |
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