CN210736792U - Xylose hydrolysate neutralizing device - Google Patents
Xylose hydrolysate neutralizing device Download PDFInfo
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- CN210736792U CN210736792U CN201921480814.4U CN201921480814U CN210736792U CN 210736792 U CN210736792 U CN 210736792U CN 201921480814 U CN201921480814 U CN 201921480814U CN 210736792 U CN210736792 U CN 210736792U
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Abstract
The utility model provides a xylose hydrolysate neutralization apparatus, install the mixing system in the barrel of this neutralization apparatus's neutralizer agitator tank, neutralizer delivery pump and pipeline are connected to the barrel under, delivery pipeline end termination neutralizer nozzle, the neutralizer nozzle soaks in the hydrolysate below the liquid level in the jar main part, the hydrolysate is with jar main part inside and is equipped with neutralization tank agitating unit, hydrolysate neutralization tank main part outer wall sets up accuse temperature jacket, thermometer and pH meter stretch into in the hydrolysate neutralization tank main part, hydrolysate neutralization tank main part bottom is equipped with sediment discharge port and neutralization liquid discharge gate, the sediment discharge port is equipped with sediment discharge valve, sediment discharge valve links to each other with calcium sulfate sediment collection device, calcium sulfate sediment collection device top is equipped with the eyepiece, calcium sulfate sediment collection device below is equipped with the sediment discharge gate. Adopt the utility model discloses can realize the high-efficient mixed xylose hydrolysate.
Description
Technical Field
The utility model relates to a xylose production facility technical field specifically is a xylose hydrolysate neutralization apparatus.
Background
Xylose is a chemical with high added value and is widely applied to the fields of food, medicine and the like, and is mainly used for producing xylitol. Xylose is mainly obtained by hydrolyzing hemicellulose plant raw material containing pentosan by dilute acid, and the catalyst commonly used at present is dilute sulfuric acid with the mass fraction of 0.5-2%. China is a large country for producing and exporting xylose and xylitol. At present, the relatively mature xylose production process comprises the following steps: hydrolysis of dilute acid, neutralization, decolorization, purification, concentration, crystallization and finished product. The principle of the neutralization process is that calcium hydroxide or calcium carbonate and the like are added to neutralize sulfuric acid in the hydrolysate to generate water or carbon dioxide in a non-ionic state, calcium sulfate which is slightly soluble in water is formed at the same time, and most of sulfate radicals and calcium ions are separated out from the hydrolysate in the form of calcium sulfate precipitation. Thus, the ion number in the hydrolysate is greatly reduced, and the pressure of the subsequent ion exchange process is obviously reduced. Sulfate radicals in the hydrolysate leave the system in the form of calcium sulfate solids, but do not enter the sewage system in the form of ions, so that the treatment capacity of anaerobic reaction of the sewage treatment system is effectively increased. However, the neutralization step is difficult to handle because of the harsh operating conditions. If the operation is not proper, the number of sulfate ions in the hydrolysate cannot be reduced, new impurities such as calcium ions can be introduced, or side reaction of xylose in the hydrolysate is caused, so that the yield and the quality of the product are influenced. This is contrary to the set purpose of the process. So many manufacturersThis step must be abandoned without the knowledge of such techniques. Therefore, the working pressure and the economic cost of the ion exchange process are obviously increased, and simultaneously, a large amount of sulfate radicals enter the sewage treatment system in the ion exchange process, so that the treatment capability of the anaerobic fermentation process is influenced, the sewage treatment cost is increased, and even the problem that the effluent does not reach the standard is caused. Xylose as a reducing monosaccharide is unstable in an alkaline environment and is easy to isomerize and decompose, and the xylose also has side reaction caused by Maillard reaction with ammonium nitrogen substances, so that the xylose yield is reduced. The use of dilute hydrochloric acid hydrolysis to prepare xylose, followed by neutralization with dilute NaOH solution, is reported in Chinese patent CN 201610843912.4, which discloses a xylose production process, which introduces the use of 0.2-0.2% dilute hydrochloric acid low temperature hydrolysis, followed by neutralization with sodium hydroxide. At present, the hydrochloric acid corrosion resistance and the abrasion resistance of the xylose hydrolysis reactor are not mature. The hydroxide ion concentration of the dilute sodium hydroxide with the same molar concentration is higher than that of calcium carbonate and calcium bicarbonate by more than 2 orders of magnitude, so that the local alkalinity of hydrolysate in the neutralization process is extremely high, the xylose loss is caused, and the side reaction is aggravated. Therefore, proper neutralizer is selected, optimal process parameters are selected, local overbasing in the reaction process is avoided, and free Ca is reduced to the maximum extent2+、SO4 2-The solubility is the key to the xylose hydrolysate neutralization process.
According to the law of conservation of mass, the mass of a neutralizing agent required to be consumed in acid-base neutralization reaction is the same, and compared with calcium hydroxide, calcium carbonate and calcium bicarbonate with the same molar concentration, the calcium bicarbonate has the highest solubility and the lowest alkalinity, the calcium hydroxide and the calcium carbonate belong to insoluble substances and enter hydrolysate in the form of suspension, the mass transfer and heat transfer rate in the reaction process is low, and the alkalinity of a reaction area is extremely high. The normal temperature solubility of the calcium bicarbonate reaches 16g/100g water, so that chemical reaction can be performed in the form of a true solution, and mass transfer and heat transfer resistance can be greatly reduced by matching a reasonable stirring device, and the generation of a local over-high alkalinity area is avoided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a xylose hydrolysate neutralization apparatus can accuse mild control hydrolysate pH valve, realizes the high-efficient mixture of xylose hydrolysate.
The utility model discloses a following technical scheme realizes above-mentioned purpose: the utility model provides a xylose hydrolysate neutralization apparatus, install the mixing system in the barrel of this neutralization apparatus's neutralizer agitator tank, neutralizer delivery pump and pipeline are connected to the barrel under, delivery pipeline end termination neutralizer nozzle, the neutralizer nozzle soaks in the hydrolysate below the liquid level in the jar main part, the hydrolysate is with jar main part inside and is equipped with neutralization tank agitating unit, hydrolysate neutralization tank main part outer wall sets up accuse temperature jacket, thermometer and pH meter stretch into in the hydrolysate neutralization tank main part, hydrolysate neutralization tank main part bottom is equipped with sediment discharge port and neutralization liquid discharge gate, the sediment discharge port is equipped with sediment discharge valve, sediment discharge valve links to each other with calcium sulfate precipitation collection device, calcium sulfate precipitation collection device top is equipped with the eyepiece, calcium sulfate precipitation collection device below is equipped with the sediment discharge gate.
And support legs are arranged on the outer side of the lower end of the hydrolysate neutralization tank main body.
The neutralizer transfer pumps include, but are not limited to, high head low flow centrifugal pumps and plunger pumps.
The neutralizer nozzle includes, but is not limited to, a fan nozzle and a spiral nozzle.
The neutralization tank stirring device includes, but is not limited to, a propeller, a straight blade propeller, a flap propeller, a gate, a ribbon stirrer.
The neutralizing tank stirring device consists of a propeller type at the bottom end and two groups of equidirectional hinge blade types at the middle part.
The distance between the bottom end of the neutralizer nozzle and the upper edge of the folding blade paddle of the stirrer is 5-20cm, so that the neutralizer is mixed in the hydrolysate to the maximum extent, and an area with overhigh alkalinity is avoided.
The installation position of the device is the position after the hydrolysis procedure and before the active carbon decoloration procedure in the whole xylose production process. Namely, the whole process comprises the following steps: hydrolysis, solid-liquid separation, neutralization, activated carbon decoloration, separation, purification, refining, concentration, crystallization, centrifugal separation and xylose pure product.
The utility model is only suitable for the xylose production process using sulfuric acid as catalyst, and is not suitable for hydrochloric acid and other products and Ca2+A process for producing an acid catalyst which does not form a precipitate.
The utility model has the advantages that:
1. adopt the utility model discloses can the accurate control material pH confirm to add neutralizer feed volume to control neutralization reaction terminal point.
2. The calcium sulfate dissolving degree in the feed liquid can be minimized by controlling the temperature of the feed liquid, the maximum calcium sulfate precipitation amount is realized, and the load is reduced for the downstream separation and purification process.
3. The rapid dispersion of the neutralizer can be better realized by matching the spray nozzle directly immersed in the hydrolysate with the stirrer, the generation of an alkali passing area is avoided, the occurrence of side reactions is reduced, and the loss of xylose is reduced.
4. The device is simple to operate, low in cost, good in mixing effect, and capable of strictly controlling key technological indexes, and playing roles in accurately controlling the temperature of reaction materials, accurately controlling the pH value of a reaction end point, and achieving an ideal and efficient mixing effect.
Drawings
Fig. 1 is a schematic structural diagram of the xylose hydrolysate neutralizing device of the present invention.
FIG. 2 is a schematic structural view of the neutralization tank and the sediment collecting device of the xylose hydrolysate neutralizing device of the present invention.
Labeled as: the device comprises a neutralizer preparation tank barrel 1, a neutralizer stirrer 2, a neutralizer delivery pump 3, a neutralizer nozzle 4, a hydrolysate neutralization tank main body 5, a neutralization tank stirrer 6, a temperature control jacket 7, a thermometer 8, a pH meter 9, a precipitation discharge port 10, a neutralization liquid discharge port 11, a calcium sulfate precipitation collecting device 12, a precipitation discharge valve 13, an eyepiece 14, a precipitation discharge port 15, support legs 16, a hydrolysate feed pipe 17, a hydrolysate feed valve 18, a temperature control jacket heat source inlet 19 and a temperature control jacket heat source outlet 20.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" in the description of the present invention are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in figures 1 to 2, the xylose hydrolysate neutralizing device of the utility model is an integrated neutralizing device, which comprises a neutralizer preparation tank and a conveying system, a hydrolysate neutralization tank and a calcium sulfate precipitation collecting device, wherein the neutralizer preparation tank comprises a neutralizer preparation cylinder body 1 and a neutralizer stirrer 2, the neutralizer preparation cylinder body 1 is internally provided with the stirrer 2, the lower end of the cylinder body 1 is connected with a neutralizer conveying pump 3 and a conveying pipeline, the tail end of the conveying pipeline is connected with a neutralizer nozzle 4, the neutralizer nozzle 4 is immersed below the liquid level in the hydrolysate neutralization tank main body 5, the hydrolysate neutralization tank main body 5 is internally provided with a neutralization tank stirrer 6, the neutralizer nozzle 4 is positioned at the upper part of the top blade of the neutralization tank stirrer 6, the distance between the two closest ends is 5-20cm, the outer wall of the hydrolysate neutralization tank main body 5 is provided with a temperature control jacket 7, a thermometer 8 and a pH meter 9 are extended into the hydrolysate neutralization tank main body 5, the bottom of the hydrolysate neutralization tank main body 5 is provided with a precipitation discharge port 10 and a neutralization solution discharge port 11, the precipitation discharge port 10 is provided with a precipitation discharge valve 13, the precipitation discharge valve 13 is connected with a calcium sulfate precipitation collection device 12, an ocular lens 14 is arranged above the calcium sulfate precipitation collection device 12, a precipitation discharge port 15 is arranged below the calcium sulfate precipitation collection device 12, the outer side of the lower end of the hydrolysate neutralization tank main body 5 is provided with supporting legs 16, the top of the hydrolysate neutralization tank main body 5 is provided with a hydrolysate inlet pipe 17 and a hydrolysate inlet valve 18, and a temperature control jacket is provided with a heat source inlet 19 and a.
The neutralizer preparation tank is used for preparing mixed slurry or solution of the neutralizer and water.
The neutralizer delivery pump 3 employs pumps including, but not limited to, high-lift low-flow centrifugal pumps and plunger pumps.
The neutralizer delivery pump 3 is a high-lift low-flow pump.
The neutralizer nozzle 4 includes, but is not limited to, a fan nozzle and a spiral nozzle.
The neutralization tank stirring device 6 includes, but is not limited to, a propeller, a straight blade propeller, a flap propeller, a gate, a ribbon stirrer.
The neutralizing tank stirring device 6 consists of a propeller type at the bottom end and a hinge type at the middle part.
The distance between the bottom end of the neutralizing agent nozzle in the neutralizing tank and the upper edge of the folding blade paddle of the stirrer is 5-20 cm.
The use method of the xylose hydrolysate neutralizing device comprises the following specific operation steps:
(1) preparing a neutralizing agent: adding calcium bicarbonate and water with specified mass into the neutralizer preparation tank, and starting a stirrer to mix uniformly for later use.
(2) Adjusting the pH value: after hydrolysis-solid-liquid separation, the xylose hydrolysate enters a hydrolysate neutralization tank through a hydrolysate feeding pipe, the liquid level is controlled to be 10-20cm below the upper edge of the hydrolysate neutralization tank, a neutralizer nozzle 4 is ensured to be completely immersed in the liquid level, a neutralizer stirrer 6 is started, a neutralizer is introduced under the normal temperature condition, the adding speed of the neutralizer is controlled to be 10-300L/min, the temperature of the hydrolysate is not more than 80 ℃, and the neutralizer is stopped being added after the pH is accurately controlled to reach the range of 4.0 +/-0.1;
(3) heat preservation and crystal growth: continuing stirring until no gas is generated, simultaneously starting a temperature control jacket, controlling the temperature at 75-85 ℃, stopping stirring, starting standing for crystal growth for 20-40min, and waiting for the calcium sulfate crystals to be completely precipitated;
(4) unloading: after the calcium sulfate crystals are completely precipitated, discharging the feed liquid through a neutralizing liquid discharge port 11, observing the precipitation amount in the calcium sulfate precipitation device 12 through an ocular 14, closing the precipitation discharge valve 13 under the condition that the precipitation is fully accumulated in the precipitation device, opening the precipitation discharge valve 15 to empty the precipitation device 12, then closing the precipitation discharge valve 15, and opening the precipitation discharge valve 13.
Claims (7)
1. The utility model provides a xylose hydrolysate neutralization apparatus, a serial communication port, install the mixing system in the barrel of this neutralization apparatus's neutralizer agitator tank, neutralizer delivery pump and pipeline are connected to the barrel under, the pipeline end termination neutralizer nozzle, the neutralizer nozzle soaks in the hydrolysate below the interior liquid level of jar main part, hydrolysate neutralization tank main part inside is equipped with neutralization tank agitating unit, hydrolysate neutralization tank main part outer wall sets up the accuse temperature jacket, thermometer and pH meter stretch into in the hydrolysate neutralization tank main part, hydrolysate neutralization tank main part bottom is equipped with sediment discharge port and neutralization liquid discharge gate, the sediment discharge port is equipped with sediment discharge valve, sediment discharge valve links to each other with calcium sulfate precipitation collection device, calcium sulfate precipitation collection device top is equipped with the eyepiece, calcium sulfate precipitation collection device below is equipped with the sediment discharge gate.
2. The xylose hydrolysate neutralizing device according to claim 1, wherein the hydrolysate neutralizing tank body is provided with support legs outside the lower end thereof.
3. The xylose hydrolysate neutralization apparatus according to claim 1, wherein the neutralizer transfer pump comprises, but is not limited to, a high head low flow centrifugal pump and a plunger pump.
4. The xylose hydrolysate neutralization apparatus according to claim 1, wherein the neutralizer nozzle comprises, but is not limited to, a fan nozzle and a spiral nozzle.
5. The xylose hydrolysate neutralization apparatus according to claim 1, wherein the neutralization tank stirring device comprises, but is not limited to, a propeller, a straight blade propeller, a flap propeller, a frame, a ribbon stirrer.
6. The xylose hydrolysate neutralization apparatus according to claim 1, wherein the neutralization tank stirring device consists of two sets of equidirectional flap paddles at the bottom end and the middle part.
7. The xylose hydrolysate neutralizing device according to claim 1, wherein the distance between the bottom end of the neutralizing agent nozzle and the upper edge of the stirrer flap blade is 5-20 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921480814.4U CN210736792U (en) | 2019-09-06 | 2019-09-06 | Xylose hydrolysate neutralizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921480814.4U CN210736792U (en) | 2019-09-06 | 2019-09-06 | Xylose hydrolysate neutralizing device |
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| Publication Number | Publication Date |
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| CN210736792U true CN210736792U (en) | 2020-06-12 |
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| CN201921480814.4U Active CN210736792U (en) | 2019-09-06 | 2019-09-06 | Xylose hydrolysate neutralizing device |
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