CN113121346A - Purification method of electronic grade dimethyl carbonate - Google Patents
Purification method of electronic grade dimethyl carbonate Download PDFInfo
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- CN113121346A CN113121346A CN201911416280.3A CN201911416280A CN113121346A CN 113121346 A CN113121346 A CN 113121346A CN 201911416280 A CN201911416280 A CN 201911416280A CN 113121346 A CN113121346 A CN 113121346A
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000000746 purification Methods 0.000 title description 5
- 238000001179 sorption measurement Methods 0.000 claims abstract description 24
- 239000003463 adsorbent Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Substances OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 239000000047 product Substances 0.000 claims description 12
- 238000003795 desorption Methods 0.000 claims description 10
- 239000006227 byproduct Substances 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 7
- 238000011069 regeneration method Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003729 cation exchange resin Substances 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000010168 coupling process Methods 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 238000007670 refining Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 150000002148 esters Chemical group 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- LOMVENUNSWAXEN-UHFFFAOYSA-N Methyl oxalate Chemical compound COC(=O)C(=O)OC LOMVENUNSWAXEN-UHFFFAOYSA-N 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
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- HZTBQULISMUXEL-UHFFFAOYSA-N dimethyl carbonate;methanol;hydrate Chemical compound O.OC.COC(=O)OC HZTBQULISMUXEL-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C68/00—Preparation of esters of carbonic or haloformic acids
- C07C68/08—Purification; Separation; Stabilisation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a method for purifying electronic grade dimethyl carbonate, which comprises the following steps: 1) taking industrial grade dimethyl carbonate as a raw material, rectifying, collecting light components at the top of the tower, collecting purified dimethyl carbonate at the side line, and collecting heavy components at the bottom of the tower; 2) adsorbing the purified dimethyl carbonate obtained in the step 1) by using an adsorbent to obtain the electronic grade dimethyl carbonate. The invention adopts the rectification-adsorption coupling process to purify the industrial grade dimethyl carbonate into the electronic grade dimethyl carbonate product with the purity of 99.99 percent, and the method is simple and easy to implement, has low investment cost and is easy for industrial application.
Description
Technical Field
The invention relates to the technical field of chemical separation, in particular to a method for purifying electronic grade dimethyl carbonate.
Background
Dimethyl carbonate (DMC for short) is an environment-friendly chemical raw material, and high-purity Dimethyl carbonate is one of important solvents of lithium battery electrolyte, namely 'blood' of a lithium ion battery. The purity requirement of the prepared electrolyte on an organic solvent is high, the impurity content is unqualified, the performance of the electrolyte is seriously influenced, the purity of the electronic grade dimethyl carbonate needs to reach more than 99.99 percent, and dehydration and impurity removal are key steps for purifying the electronic grade dimethyl carbonate. The method is characterized in that coal-to-ethylene glycol industry develops well, dimethyl oxalate as an intermediate product of coal-to-ethylene glycol can be used as a byproduct of dimethyl carbonate while being generated, industrial grade dimethyl carbonate can be obtained after preliminary purification, electronic grade dimethyl carbonate is prepared by taking industrial grade dimethyl carbonate as a raw material and further refining and removing impurities, the industrial grade dimethyl carbonate obtained after preliminary refining of the dimethyl carbonate as a byproduct of coal-to-ethylene glycol still contains more impurities, and especially compared with dimethyl carbonate synthesized by a traditional process, the dimethyl carbonate as the byproduct of coal-to-ethylene glycol has more impurities and is more difficult to separate. At present, the purification process of electronic grade dimethyl carbonate is used for refining dimethyl carbonate produced by the traditional ester exchange process, the types of impurities of dimethyl carbonate as a byproduct in the process of preparing ethylene glycol from coal are different from those of the traditional ester exchange process, the azeotropic condition of other various impurities and dimethyl carbonate exists besides the multi-azeotropic condition of methanol-water-dimethyl carbonate, and 99.99 percent of product is difficult to separate by adopting the traditional mode. Aiming at the byproduct dimethyl carbonate in the process of preparing ethylene glycol from coal, CN109970565A adopts a rectification crystallization coupling process to prepare electronic grade dimethyl carbonate, but the crystallization method has low product yield and high low energy consumption.
Therefore, the invention adopts a rectification and adsorption combined method to remove impurities including water, methanol and other complex hydrocarbon and oxygen-containing hydrocarbon aiming at the byproduct dimethyl carbonate raw material for preparing the ethylene glycol from coal, and the dimethyl carbonate with the purity of 99.99 percent is obtained by refining.
Disclosure of Invention
The invention provides a method for purifying electronic grade dimethyl carbonate, which aims to solve the technical problem that the electronic grade dimethyl carbonate is difficult to separate from the byproduct dimethyl carbonate in the process of preparing ethylene glycol from coal in the prior art.
The invention is realized by the following technical scheme:
the invention provides a method for purifying electronic grade dimethyl carbonate, which comprises the following steps:
1) taking industrial grade dimethyl carbonate as a raw material, rectifying, collecting light components at the top of the tower, collecting purified dimethyl carbonate at the side line, and collecting heavy components at the bottom of the tower;
2) adsorbing the purified dimethyl carbonate obtained in the step 1) by using an adsorbent to obtain the electronic grade dimethyl carbonate.
Preferably, in the step 2), the dimethyl carbonate obtained by adsorption is detected, and if the purity is less than 99.99%, the dimethyl carbonate obtained by adsorption is returned to the step 1) for rectification, and the adsorption is suspended at the same time, and the adsorbent is subjected to desorption and regeneration.
More preferably, the adsorbent is subjected to desorption regeneration by using gas purging at 100-500 ℃. More preferably, the gas is purged at 100 to 300 ℃.
More preferably, the desorption regeneration time is 2-6 h. More preferably, the desorption regeneration time is 4-6 h.
Preferably, in the step 1), rectifying by a rectifying tower; in the step 2), adsorbing by an adsorber.
More preferably, the rectifying tower is a packed tower, and the number of theoretical plates is 50 to 200, such as 50 to 100 or 100 to 200, except for the top and the bottom of the tower.
Even more preferably, the packing type of the packed column is a perforated plate corrugated packing.
Preferably, in step 1), the feedstock is fed from the upper part of the rectification column. More preferably, the raw material is fed from 15 th to 50 th theoretical carbon plates of the rectifying tower, such as 15 th to 25 th or 25 th to 50 th theoretical carbon plates.
Preferably, in step 1), the purified dimethyl carbonate is taken off from the middle-lower side of the rectification column. More preferably, the purified dimethyl carbonate is taken out from the side of the rectifying tower at the 38 th to 150 th theoretical plates, such as 38 to 75 or 75 to 150 th theoretical plates.
Preferably, in step 1), the reflux ratio is 20-200, such as 20-80 or 80-200.
Preferably, in the step 1), the temperature at the top of the tower is 75-90 ℃, such as 75-80 ℃, 80-82 ℃, 82-88 ℃ or 88-90 ℃.
Preferably, in the step 1), the temperature of the tower plate at the side extraction part is 90-91 ℃, such as 90-90.1 ℃, 90.1-90.2 ℃, 90.2-90.3 ℃, 90.3-90.5 ℃ or 90.5-91 ℃. More preferably, the temperature of the tower plate at the side extraction part is 90.1-90.3 ℃.
Preferably, in the step 1), the temperature of the tower kettle is 90-95 ℃, such as 90-91 ℃, 91-92 ℃, 92-93 ℃ or 93-95 ℃. More preferably, the temperature of the tower kettle is 93-95 ℃.
Preferably, in the step 1), the industrial-grade dimethyl carbonate is a refined product of dimethyl carbonate which is a byproduct of the preparation of ethylene glycol from coal.
Preferably, in the step 1), the purity of the industrial grade dimethyl carbonate is 90-99.9%. More preferably, the purity of the technical grade dimethyl carbonate is 95% to 99.9%, such as 95% to 99.7% or 99.7% to 99.9%.
Preferably, in the step 1), the mass fraction of the purified dimethyl carbonate which is extracted from the side line is 99.8-99.9%.
Preferably, in step 2), the adsorbent is selected from at least one of silica gel, cation exchange resin, zeolite molecular sieve with pore size larger than 3A, activated alumina and activated carbon.
Preferably, in the step 2), the adsorption temperature is 20-30 ℃, such as 20-25 ℃ or 25-30 ℃. More preferably, the adsorption temperature is 25-30 ℃.
Preferably, in the step 2), the flow rate of the purified dimethyl carbonate is 1-10 BV, such as 1-2 BV, 2-5 BV or 5-10 BV. More preferably, the flow rate of the purified dimethyl carbonate is 2-5 BV. 1BV liquid hourly volumetric flow/adsorbent bed volume.
Compared with the prior art, the invention has the following beneficial effects: the rectification-adsorption coupling process is adopted to purify the industrial grade dimethyl carbonate into 99.99 percent of electronic grade dimethyl carbonate products, and the method is simple and easy to implement, has low investment cost and is easy for industrial application.
Drawings
FIG. 1 is a flow chart of the purification method of electronic grade dimethyl carbonate.
Reference numerals:
1-technical grade dimethyl carbonate;
2-discharging from the top of the rectifying tower;
3-discharging from a tower kettle of the rectifying tower;
4-side line discharging of the rectifying tower;
5-high temperature nitrogen for adsorption;
6-discharge of electronic grade dimethyl carbonate;
7-a rectifying tower;
8-adsorber.
Detailed Description
The technical solution of the present invention is illustrated by specific examples below. It is to be understood that one or more method steps mentioned in the present invention do not exclude the presence of other method steps before or after the combination step or that other method steps may be inserted between the explicitly mentioned steps; it should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
A flow chart of a stripping method as an embodiment is shown in fig. 1, and includes the following steps:
(1) and (3) rectification by a rectifying tower 7: firstly, starting a feed pump, introducing industrial-grade dimethyl carbonate 1 into a rectifying tower until the liquid level of a tower kettle of the rectifying tower reaches 50-60%, closing the feed pump, starting heating equipment at the tower kettle of the rectifying tower and condensing equipment at the tower top of the rectifying tower, performing total reflux operation, starting feeding after the temperature and concentration distribution of the whole tower are stable, extracting light components from a tower top discharge 2 of the rectifying tower, extracting purified dimethyl carbonate from a side discharge 4 of the rectifying tower, and extracting heavy components from a tower kettle discharge 3 of the rectifying tower.
(2) Adsorption by the adsorber 8: taking purified dimethyl carbonate extracted from the side line of the rectifying tower as an adsorption raw material, feeding the raw material from the upper end of an adsorber, flowing through the adsorber at a certain airspeed, adsorbing by using high-temperature nitrogen 5, sampling and analyzing the product after adsorption at regular time, collecting the product as a final product, namely an electronic grade dimethyl carbonate discharge material 6 after the product is qualified after analysis, stopping feeding when the product is unqualified, returning to the step (1), purging a bed layer by using 1 high-temperature nitrogen for desorption, and circulating the adsorption step after desorption.
Example 1
The method comprises the steps of feeding industrial dimethyl carbonate with the purity of 95% from a 50 th theoretical plate by adopting a packed tower with the theoretical plate number of 200, extracting purified dimethyl carbonate from a 150 th lateral line at the theoretical plate, wherein the reflux ratio is 20, the temperature of the top of the tower is 75-80 ℃, the temperature of the plate at the lateral line extraction position is 90.5-91.0 ℃, the temperature of the bottom of the tower is 93-95 ℃, and the analysis results of the industrial dimethyl carbonate and the purified dimethyl carbonate extracted from the lateral line are shown in Table 1.
TABLE 1
Example 2
A packed tower with the theoretical plate number of 100 is adopted, industrial dimethyl carbonate with the purity of 99.7 percent is fed from a 25 th plate, purified dimethyl carbonate is extracted from the side line of a 75 th theoretical plate, the reflux ratio is 80, the temperature of the top of the tower is 80-82 ℃, the temperature of the plate at the side line extraction position is 90.0-90.3 ℃, the temperature of the bottom of the tower is 92-93 ℃, and the analysis results of the industrial dimethyl carbonate and the purified dimethyl carbonate extracted from the side line are shown in Table 2.
TABLE 2
Example 3
A packed tower with 50 theoretical plates is adopted, industrial dimethyl carbonate with the purity of 99.9 percent is fed from a 15 th theoretical plate, side-draw purified dimethyl carbonate from a 38 th theoretical plate is adopted, the reflux ratio is 200, the temperature of the top of the tower is 88-90 ℃, the temperature of the plate at the side-draw position is 90.1-90.5 ℃, the temperature of the bottom of the tower is 90-91 ℃, and the analysis results of the industrial dimethyl carbonate and the side-draw purified dimethyl carbonate are shown in Table 3.
TABLE 3
Example 4
The dimethyl carbonate purified by side extraction in example 1 is used as an adsorption raw material, 50ml of activated carbon adsorbent is filled into an adsorber, the activated carbon adsorbent is fed from the upper end of the adsorber at the airspeed of 1-2 BV, the adsorption operation temperature is 25-30 ℃, and the analysis results of the adsorbed product are shown in Table 4.
TABLE 4
Example 5
The adsorbent used in the adsorption in example 4 was kept at a constant temperature of 150 ℃ for 3 hours under a flowing nitrogen atmosphere, and a desorption experiment was carried out in the same manner as in example 4, and the results are shown in Table 5.
TABLE 5
Example 6
The dimethyl carbonate purified by side extraction in example 1 is used as an adsorption raw material, 50ml of activated carbon adsorbent is filled into an adsorber, the activated carbon adsorbent is fed from the upper end of the adsorber at the airspeed of 5-10 BV, the operation temperature of adsorption is 25-30 ℃, and the analysis results of the adsorbed product are shown in Table 6.
TABLE 6
Example 7
The dimethyl carbonate purified by side extraction in example 1 is used as an adsorption raw material, 50ml of 5A molecular sieve adsorbent is filled into an adsorber, the material is fed from the upper end of the adsorber at the airspeed of 2-5 BV, the adsorption operation temperature is 20-25 ℃, and the analysis results of the adsorbed products are shown in Table 7.
TABLE 7
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. A method for purifying electronic grade dimethyl carbonate is characterized by comprising the following steps:
1) taking industrial grade dimethyl carbonate as a raw material, rectifying, collecting light components at the top of the tower, collecting purified dimethyl carbonate at the side line, and collecting heavy components at the bottom of the tower;
2) adsorbing the purified dimethyl carbonate obtained in the step 1) by using an adsorbent to obtain the electronic grade dimethyl carbonate.
2. The method for purifying electronic grade dimethyl carbonate according to claim 1, wherein in the step 2), the dimethyl carbonate obtained by adsorption is detected, and if the purity is less than 99.99%, the dimethyl carbonate obtained by adsorption is returned to the step 1) for rectification; the adsorption is suspended, and the desorption regeneration is carried out on the adsorbent.
3. The method of claim 2, further comprising at least one of the following technical features:
1) blowing by using gas at 100-500 ℃ so as to realize desorption and regeneration of the adsorbent;
2) the desorption regeneration time is 2-6 h.
4. The method for purifying electronic grade dimethyl carbonate according to claim 1, wherein in the step 1), the raw materials are rectified by a rectifying tower; in the step 2), adsorbing by an adsorber.
5. The method for purifying electronic grade dimethyl carbonate according to claim 4, wherein the rectifying tower is a packed tower, and the number of theoretical plates is 50 to 200 except for the top and the bottom of the tower.
6. The method of claim 5, wherein the type of packing in the packed column is perforated corrugated packing.
7. The method of purifying electronic grade dimethyl carbonate according to claim 1, further comprising at least one of the following technical features:
1) in the step 1), the raw material is fed from the upper part of a rectifying tower;
2) in the step 1), the purified dimethyl carbonate is extracted from the middle lower part of a rectifying tower;
3) in the step 1), the reflux ratio is 20-200;
4) in the step 1), the temperature at the top of the tower is 75-90 ℃;
5) in the step 1), the temperature of a tower plate at the side extraction part is 90-91 ℃;
6) in the step 1), the temperature of the tower kettle is 90-95 ℃.
8. The method of claim 7, further comprising at least one of the following technical features:
11) in the characteristic 1), the raw material is fed from a 15 th to 50 th theoretical carbon plate of a rectifying tower;
21) in the characteristic 2), the purified dimethyl carbonate is extracted from the side line of a theoretical plate from 38 th to 150 th of a rectifying tower;
51) the characteristic 5) is that the temperature of the tower plate at the side extraction part is 90.1-90.3 ℃;
61) the characteristic 6) is that the temperature of the tower kettle is 93-95 ℃.
9. The method for purifying electronic grade dimethyl carbonate according to claim 1, wherein the step 1) further comprises at least one of the following technical features:
1) the industrial grade dimethyl carbonate is a refined product of a byproduct dimethyl carbonate of the coal-to-ethylene glycol production;
2) the purity of the industrial grade dimethyl carbonate is 90-99.9%;
3) the mass fraction of the purified dimethyl carbonate collected from the side line is 99.8-99.9%.
10. The method for purifying electronic grade dimethyl carbonate according to claim 1, wherein the step 2) further comprises at least one of the following technical features:
1) the adsorbent is selected from at least one of silica gel, cation exchange resin, zeolite molecular sieve with the pore diameter larger than 3A, activated alumina and activated carbon;
2) the adsorption temperature is 20-30 ℃;
3) the flow rate of the purified dimethyl carbonate is 1-10 BV.
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| CN114504872A (en) * | 2022-02-15 | 2022-05-17 | 北京袭明科技有限公司 | Method and device for producing high-purity electronic grade ethylene glycol |
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Application publication date: 20210716 |