CN117625699A - Production process and production system of salicylic acid without waste odor - Google Patents
Production process and production system of salicylic acid without waste odor Download PDFInfo
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- CN117625699A CN117625699A CN202311593901.1A CN202311593901A CN117625699A CN 117625699 A CN117625699 A CN 117625699A CN 202311593901 A CN202311593901 A CN 202311593901A CN 117625699 A CN117625699 A CN 117625699A
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- salicylic acid
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- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 title claims abstract description 184
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229960004889 salicylic acid Drugs 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 239000002699 waste material Substances 0.000 title claims abstract description 26
- 238000000855 fermentation Methods 0.000 claims abstract description 65
- 230000004151 fermentation Effects 0.000 claims abstract description 65
- 238000004821 distillation Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000007670 refining Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 241000609240 Ambelania acida Species 0.000 claims abstract description 19
- 239000010905 bagasse Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims abstract description 10
- 238000010170 biological method Methods 0.000 claims abstract description 9
- 108090000790 Enzymes Proteins 0.000 claims abstract description 7
- 102000004190 Enzymes Human genes 0.000 claims abstract description 7
- 240000000111 Saccharum officinarum Species 0.000 claims abstract description 7
- 235000007201 Saccharum officinarum Nutrition 0.000 claims abstract description 7
- 229940088598 enzyme Drugs 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 7
- 239000004382 Amylase Substances 0.000 claims abstract description 4
- 102000013142 Amylases Human genes 0.000 claims abstract description 4
- 108010065511 Amylases Proteins 0.000 claims abstract description 4
- 108010059892 Cellulase Proteins 0.000 claims abstract description 4
- 235000019418 amylase Nutrition 0.000 claims abstract description 4
- 229940106157 cellulase Drugs 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 238000000638 solvent extraction Methods 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 4
- 241000186660 Lactobacillus Species 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012043 crude product Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 3
- 229940039696 lactobacillus Drugs 0.000 claims description 3
- 238000012417 linear regression Methods 0.000 claims description 3
- 238000000199 molecular distillation Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 230000009965 odorless effect Effects 0.000 claims 8
- 239000002912 waste gas Substances 0.000 abstract description 5
- JCYWCSGERIELPG-UHFFFAOYSA-N imes Chemical class CC1=CC(C)=CC(C)=C1N1C=CN(C=2C(=CC(C)=CC=2C)C)[C]1 JCYWCSGERIELPG-UHFFFAOYSA-N 0.000 description 6
- 239000002006 petroleum coke Substances 0.000 description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004449 solid propellant Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Abstract
The invention relates to the technical field of salicylic acid production, in particular to a production process and a production system of salicylic acid without waste odor, comprising the production process of salicylic acid without waste odor, wherein the process adopts a biological method, adopts bagasse as a raw material, and prepares salicylic acid through saccharification, fermentation, distillation, refining and other steps, and the specific steps of the process are as follows: s1: pretreating bagasse, removing impurities, and then crushing the bagasse to obtain bagasse powder; s2: saccharifying the sugarcane slag powder with enzymes such as cellulase and amylase to obtain saccharified liquid; s3: the saccharified liquid is inoculated with yeast, and the salicylic acid is prepared by adopting a biological method and taking bagasse as a raw material through saccharification, fermentation, distillation, refining and other steps, so that the waste gas emission can be effectively reduced, the environment is protected, the raw material cost is low, in addition, the salicylic acid production process by adopting the biological method is simple, the operation is convenient, the safety in the production process can be ensured, and the salicylic acid production process is easy to popularize.
Description
Technical Field
The invention relates to the technical field of salicylic acid production, in particular to a production process and a production system of salicylic acid without waste odor.
Background
Salicylic acid is an important chemical raw material, has a plurality of effects of diminishing inflammation, resisting bacteria, resisting oxidation and the like, and is applied to the fields of medicines, cosmetics, foods and the like, and the production process of the salicylic acid generally comprises the steps of saccharification, fermentation, distillation, refining and the like;
the traditional salicylic acid production process adopts a chemical method, uses petroleum coke as a raw material, and reacts at high temperature and high pressure to generate salicylic acid, wherein the petroleum coke is a black solid fuel prepared from coal by high-temperature carbonization, the components of the black solid fuel are mainly carbon, and the black solid fuel also contains a small amount of sulfur, hydrogen, oxygen and other elements, in the salicylic acid production process, the petroleum coke reacts with the hydrogen at high temperature and high pressure to generate phenol, then the phenol reacts with formaldehyde under an acidic condition to generate salicylic acid,
the process has the following problems: the waste gas emission is large, pollution is serious, a large amount of waste gas including carbon dioxide, carbon monoxide, hydrogen sulfide and the like can be generated in the salicylic acid production process, the waste gas can cause environmental pollution, the human health is affected, the raw material source is limited, the cost is high, the petroleum coke is a non-renewable resource, the source is limited, and in addition, a large amount of coal resources are required for the petroleum coke production, and the cost is high; the process is complex, the operation is difficult, the safety accident is easy to occur, the traditional salicylic acid production process adopts high-temperature high-pressure reaction, the process is complex, the operation is difficult, and the safety accident is easy to occur;
therefore, a production process and a production system of salicylic acid without waste odor are provided for the problems.
Disclosure of Invention
The invention aims to provide a production process and a production system of salicylic acid without waste odor, which are used for solving the problems of large exhaust emission, higher cost, complex process and easy occurrence of safety accidents existing in the traditional salicylic acid production process by adopting a chemical method.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a production process and a production system of salicylic acid without waste odor comprise a production process of salicylic acid without waste odor, the process adopts a biological method, bagasse is used as a raw material, and salicylic acid is prepared by saccharification, fermentation, distillation, refining and other steps, and the specific steps of the process are as follows:
s1: pretreating bagasse, removing impurities, and then crushing the bagasse to obtain bagasse powder;
s2: saccharifying the sugarcane slag powder with enzymes such as cellulase and amylase to obtain saccharified liquid;
s3: inoculating yeast to the saccharification liquid, and fermenting by adopting yeast strains such as lactobacillus, yeast and the like to obtain fermentation liquid;
s4: distilling the fermentation liquor, and distilling in a plurality of distillation towers, so that the distillation efficiency can be improved, the distillation is performed under vacuum, and the vapor pressure of salicylic acid is improved, so that a salicylic acid crude product is obtained;
s5: refining the crude salicylic acid, separating salicylic acid from other impurities by solvent extraction, and crystallizing to separate out salicylic acid from the solution to obtain pure salicylic acid;
s6: salicylic acid production was predicted during production and compared to actual production.
As a further scheme of the invention, the saccharification temperature is generally controlled to be 60-70 ℃, the saccharification temperature is gradually increased in the saccharification process, the time is generally controlled to be 3-5 hours, inorganic salt is added in the saccharification process, the saccharification reaction is carried out in a saccharification reactor, the saccharification reactor adopts continuous operation, and the sugarcane slag powder and the enzyme preparation are continuously added into the reactor for continuous saccharification.
As a further scheme of the invention, the saccharification reaction adopts a stirring type saccharification reactor, and the stirrer adopts a multi-blade stirrer and is provided with a heating system and a cooling system.
As a further scheme of the invention, the fermentation reaction is carried out in a fermentation reactor, and the waste odor is removed by adopting an active carbon adsorption method in the fermentation process, and the natural active carbon is adopted for adsorption.
As a further scheme of the invention, the fermentation reactor adopts gas-liquid mixed fermentation, and the gas-liquid mixed fermentation adopts continuous fermentation.
As a further scheme of the invention, the distillation tower adopts molecular distillation, the distillation temperature is controlled between 100 ℃ and 120 ℃, the pressure is generally controlled between 0.1 MPa and 0.2MPa, the steam flow is generally controlled between 100 kg/h and 200kg/h, and the reflux ratio is controlled between 1.5 and 2.0.
As a further scheme of the invention, the refining adopts solvent extraction, ethanol is used for extracting salicylic acid, the extraction temperature is 50 ℃, the extraction time is 1.5 hours, and a distillation device is adopted for distilling and recovering the solvent in the waste liquid.
As a further aspect of the invention, salicylic acid yield is predicted by extracting samples from saccharification, fermentation, distillation, refining, etc.:
collecting data of production process parameters and salicylic acid yield: saccharification temperature, fermentation temperature, distillation temperature, and salicylic acid yield; training the model by adopting a linear regression model to obtain parameters:
\theta＝[1.5,2.0,2.5,-1.0]
salicylic acid yield was predicted using a model:
y= \theta = 1.5\t imes saccharification temperature +2.0\t imes fermentation temperature +2.5\t imes distillation temperature-1.0 = salicylic acid yield;
the errors in predicted and actual yields are then compared.
As a further aspect of the invention, when the error is large, the relevant steps of saccharification, fermentation, distillation, refining, etc. are monitored, error = predicted yield-actual yield.
As a further scheme of the invention, the system comprises a saccharification reactor, a fermentation reactor, a distillation tower, a refining system and the like, wherein the saccharification reactor, the fermentation reactor, the distillation tower and the refining system are respectively used for saccharification, fermentation, distillation and refining of salicylic acid.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, the biological method is adopted, bagasse is used as a raw material, and salicylic acid is prepared through saccharification, fermentation, distillation, refining and other steps, so that the waste gas emission can be effectively reduced, the environment is protected, the raw material cost is lower, in addition, the biological method for producing the salicylic acid has simple process, convenient operation, and easy popularization, and the safety in the production process can be ensured;
2. in the invention, the active carbon adsorption method is adopted to remove the waste odor in the fermentation process, and pretreatment is carried out before the distillation of the fermentation liquor, so that the waste odor generated in the fermentation process can be removed, and the production environment of a production workshop can be improved;
3. in the invention, biomass such as bagasse is used as a raw material in the production process of the salicylic acid by a biological method, and the salicylic acid is generated by microbial fermentation.
Drawings
FIG. 1 is a diagram of the production process of salicylic acid without waste odor.
Detailed Description
Referring to fig. 1, the present invention provides a technical solution:
a production process and a production system of salicylic acid without waste odor comprise a production process of salicylic acid without waste odor, the process adopts a biological method, bagasse is used as a raw material, and salicylic acid is prepared by saccharification, fermentation, distillation, refining and other steps, and the specific steps of the process are as follows:
s1: pretreating bagasse, removing impurities, and then crushing the bagasse to obtain bagasse powder;
s2: saccharifying the sugarcane slag powder with enzymes such as cellulase and amylase to obtain saccharified liquid;
s3: inoculating yeast to the saccharification liquid, and fermenting by adopting yeast strains such as lactobacillus, yeast and the like to obtain fermentation liquid;
s4: distilling the fermentation liquor, and distilling in a plurality of distillation towers, so that the distillation efficiency can be improved, the distillation is performed under vacuum, and the vapor pressure of salicylic acid is improved, so that a salicylic acid crude product is obtained;
s5: refining the crude salicylic acid, separating salicylic acid from other impurities by solvent extraction, and crystallizing to separate out salicylic acid from the solution to obtain pure salicylic acid;
s6: salicylic acid production was predicted during production and compared to actual production.
As a further embodiment of the above technical solution: the saccharification temperature is generally controlled to be 60-70 ℃, the saccharification temperature is gradually increased in the saccharification process, the time is generally controlled to be 3-5 hours, inorganic salt is added in the saccharification process, the saccharification reaction is carried out in a saccharification reactor, the saccharification reactor adopts continuous operation, and the sugarcane slag powder and the enzyme preparation are continuously added into the reactor for continuous saccharification, so that the saccharification efficiency can be improved and the production cost can be reduced by continuous saccharification;
as a further embodiment of the above technical solution: the saccharification reaction adopts a stirring type saccharification reactor, and the stirrer adopts a multi-blade stirrer and is provided with a heating system and a cooling system, and the stability in the saccharification process can be further improved by the saccharification reaction carried out by the stirring type saccharification reactor;
as a further embodiment of the above technical solution: the fermentation reaction is carried out in a fermentation reactor, the waste odor is removed by adopting an active carbon adsorption method in the fermentation process, natural active carbon is adopted for adsorption, and pretreatment is carried out before fermentation liquor is distilled, so that the waste odor generated in the fermentation process can be removed;
as a further embodiment of the above technical solution: the fermentation reactor adopts gas-liquid mixed fermentation, and the gas-liquid mixed fermentation adopts continuous fermentation. The gas-liquid mixed fermentation can improve the fermentation efficiency and reduce the production cost;
as a further embodiment of the above technical solution: the distillation tower adopts molecular distillation, the distillation temperature is controlled between 100 ℃ and 120 ℃, the pressure is generally controlled between 0.1 MPa and 0.2MPa, the steam flow is generally controlled between 100 kg/h and 200kg/h, and the reflux ratio is controlled between 1.5 kg/h and 2.0, so that the distillation efficiency can be improved, and the production cost is reduced;
as a further embodiment of the above technical solution: the refining adopts solvent extraction, ethanol is used for extracting salicylic acid, the extraction temperature is 50 ℃, the extraction time is 1.5 hours, and a distillation device is adopted for distilling and recovering the solvent in the waste liquid, so that the generation of the waste liquid can be reduced;
data of the effect of extraction temperature and extraction time on salicylic acid content:
| extraction temperature | Extraction time | Salicylic acid content |
| 20℃ | 1 hour | 90％ |
| 30℃ | 1 hour | 95％ |
| 40℃ | 1 hour | 98％ |
| 50℃ | 1 hour | 99％ |
| 60℃ | 1 hour | 99.5％ |
As a further embodiment of the above technical solution: the salicylic acid yield is predicted by extracting samples from saccharification, fermentation, distillation, refining and other steps:
collecting data of production process parameters and salicylic acid yield: saccharification temperature, fermentation temperature, distillation temperature, and salicylic acid yield; training the model by adopting a linear regression model to obtain parameters:
\theta＝[1.5,2.0,2.5,-1.0]
salicylic acid yield was predicted using a model:
y= \theta = 1.5\t imes saccharification temperature +2.0\t imes fermentation temperature +2.5\t imes distillation temperature-1.0 = salicylic acid yield;
then comparing the errors of the predicted yield and the actual yield, and judging the actual yield through the prediction by the method, so that the method can be used as a standard for judging the quality of the production process;
salicylic acid yield data at saccharification temperature 70 ℃, fermentation temperature 35 ℃ using a refining method:
| saccharification temperature | Fermentation temperature | Distillation temperature | Refining method | Salicylic acid yield |
| 70℃ | 35℃ | 120℃ | Solvent extraction | 110kg/t |
As a further embodiment of the above technical solution: when the error is large, the related steps of saccharification, fermentation, distillation, refining and the like are monitored, the error = predicted yield-actual yield, and whether the problem exists in the production process can be effectively fed back through the error value;
as a further embodiment of the above technical solution: the system comprises a saccharification reactor, a fermentation reactor, a distillation tower, a refining system and the like, wherein the saccharification reactor, the fermentation reactor, the distillation tower and the refining system are respectively used for saccharification, fermentation, distillation and refining of salicylic acid, and the salicylic acid without waste odor can be stably produced through the systems.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this invention, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the invention, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present invention.
Claims (10)
1. The production process of the salicylic acid without waste odor comprises the production process of the salicylic acid without waste odor, and is characterized in that: the process adopts a biological method, adopts bagasse as a raw material, and prepares salicylic acid through saccharification, fermentation, distillation, refining and other steps, and the specific steps of the process are as follows:
s1: pretreating bagasse, removing impurities, and then crushing the bagasse to obtain bagasse powder;
s2: saccharifying the sugarcane slag powder with enzymes such as cellulase and amylase to obtain saccharified liquid;
s3: inoculating yeast to the saccharification liquid, and fermenting by adopting yeast strains such as lactobacillus, yeast and the like to obtain fermentation liquid;
s4: distilling the fermentation liquor, and distilling in a plurality of distillation towers, so that the distillation efficiency can be improved, the distillation is performed under vacuum, and the vapor pressure of salicylic acid is improved, so that a salicylic acid crude product is obtained;
s5: refining the crude salicylic acid, separating salicylic acid from other impurities by solvent extraction, and crystallizing to separate out salicylic acid from the solution to obtain pure salicylic acid;
s6: salicylic acid production was predicted during production and compared to actual production.
2. The process for producing odorless salicylic acid according to claim 1, wherein: the saccharification temperature is generally controlled to be 60-70 ℃, the saccharification temperature is gradually increased in the saccharification process, the time is generally controlled to be 3-5 hours, inorganic salt is added in the saccharification process, the saccharification reaction is carried out in a saccharification reactor, the saccharification reactor adopts continuous operation, and the sugarcane slag powder and the enzyme preparation are continuously added into the reactor for continuous saccharification.
3. The process for producing odorless salicylic acid according to claim 1, wherein: the saccharification reaction adopts a stirring type saccharification reactor, and the stirrer adopts a multi-blade stirrer and is provided with a heating system and a cooling system.
4. The process for producing odorless salicylic acid according to claim 1, wherein: the fermentation reaction is carried out in a fermentation reactor, and the waste odor is removed by adopting an active carbon adsorption method in the fermentation process, and the natural active carbon is adopted for adsorption.
5. The process for producing odorless salicylic acid according to claim 1, wherein: the fermentation reactor adopts gas-liquid mixed fermentation, and the gas-liquid mixed fermentation adopts continuous fermentation.
6. The process for producing odorless salicylic acid according to claim 1, wherein: the distillation tower adopts molecular distillation, the distillation temperature is controlled between 100 ℃ and 120 ℃, the pressure is generally controlled between 0.1 MPa and 0.2MPa, the steam flow is generally controlled between 100 kg/h and 200kg/h, and the reflux ratio is controlled between 1.5 and 2.0.
7. The process for producing odorless salicylic acid according to claim 1, wherein: the refining adopts solvent extraction, ethanol is used for extracting salicylic acid, the extraction temperature is 50 ℃, the extraction time is 1.5 hours, and a distillation device is adopted for distilling and recovering the solvent in the waste liquid.
8. The process for producing odorless salicylic acid according to claim 1, wherein: the salicylic acid yield is predicted by extracting samples from saccharification, fermentation, distillation, refining and other steps:
collecting data of production process parameters and salicylic acid yield: saccharification temperature, fermentation temperature, distillation temperature, and salicylic acid yield; training the model by adopting a linear regression model to obtain parameters:
\theta＝[1.5,2.0,2.5,-1.0]
salicylic acid yield was predicted using a model:
y= \theta = 1.5\times saccharification temperature +2.0\times fermentation temperature +2.5\times distillation temperature-1.0 = salicylic acid yield;
the errors in predicted and actual yields are then compared.
9. The process for producing odorless salicylic acid according to claim 8, wherein: when the error is large, the related steps of saccharification, fermentation, distillation, refining and the like are monitored,
error = predicted yield-actual yield.
10. A system for producing salicylic acid without waste odor according to claim 1 wherein: the system comprises a saccharification reactor, a fermentation reactor, a distillation tower, a refining system and the like, wherein the saccharification reactor, the fermentation reactor, the distillation tower and the refining system are respectively used for saccharification, fermentation, distillation and refining of salicylic acid.
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