CN201762268U - Chlorohydrination reaction control system - Google Patents
Chlorohydrination reaction control system Download PDFInfo
- Publication number
- CN201762268U CN201762268U CN2010202287747U CN201020228774U CN201762268U CN 201762268 U CN201762268 U CN 201762268U CN 2010202287747 U CN2010202287747 U CN 2010202287747U CN 201020228774 U CN201020228774 U CN 201020228774U CN 201762268 U CN201762268 U CN 201762268U
- Authority
- CN
- China
- Prior art keywords
- propylene
- chlorine
- gas
- chlorohydrin
- mixed gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 30
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 104
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 103
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000460 chlorine Substances 0.000 claims abstract description 42
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 32
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- XENVCRGQTABGKY-ZHACJKMWSA-N chlorohydrin Chemical compound CC#CC#CC#CC#C\C=C\C(Cl)CO XENVCRGQTABGKY-ZHACJKMWSA-N 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 9
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 9
- MZPBNFLTHBUURE-UHFFFAOYSA-N C=CC.[Cl] Chemical group C=CC.[Cl] MZPBNFLTHBUURE-UHFFFAOYSA-N 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000007086 side reaction Methods 0.000 abstract description 9
- 239000007795 chemical reaction product Substances 0.000 abstract description 2
- YYTSGNJTASLUOY-UHFFFAOYSA-N 1-chloropropan-2-ol Chemical class CC(O)CCl YYTSGNJTASLUOY-UHFFFAOYSA-N 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 44
- RZWHKKIXMPLQEM-UHFFFAOYSA-N 1-chloropropan-1-ol Chemical compound CCC(O)Cl RZWHKKIXMPLQEM-UHFFFAOYSA-N 0.000 description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- KNKRKFALVUDBJE-UHFFFAOYSA-N 1,2-dichloropropane Chemical group CC(Cl)CCl KNKRKFALVUDBJE-UHFFFAOYSA-N 0.000 description 3
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a chlorohydrination reaction control system, and is mainly designed for reducing the occurrence of side reactions and increasing the output ratio of propylene chlorohydrins, namely reaction products of a chlorohydrination reaction. The control system comprises a propylene evaporator, a chlorine gas pre-dissolving device, a chlorohydrin reactor, a propylene recovery tower and a propylene chlorohydrins separator; a material input end of the chlorohydrin reactor is respectively communicated with a material output end of the propylene evaporator, a material output end of the chlorine gas pre-dissolving device, and a material output end of the propylene recovery tower; a material output end of the chlorohydrin reactor is communicated with a material inlet end of the propylene recovery tower; and a chlorine gas- propylene ratio regulating system is arranged at a material input end of the chlorine gas pre-dissolving device and between the propylene evaporator and the chlorohydrin reactor. The control system regulates the flow rate of propylene mixture gas according to the flow rate of reacted chlorine gas, thereby keeping the molar ratio of the propylene mixture gas to the chlorine gas at between 1.6 and 1.7, increasing the output ratio of propylene chlorohydrins, and reducing the occurrence of side reactions.
Description
Technical Field
The utility model belongs to the technical field of chemical production and specifically relates to a propylene oxide production control system.
Background
Propylene and chlorine are main raw materials for producing propylene oxide, and during chlorohydrination reaction, water, propylene and chlorine enter a reactor to carry out chemical reaction to generate chloropropanol, which is a main reaction process. Meanwhile, a side reaction process of directly carrying out chemical reaction on the propylene and the chlorine gas also occurs, and a side reaction product is dichloropropane. Since dichloropropane can dissolve propylene, the amount of propylene in the main reaction is reduced, and a large amount of propylene and chlorine gas are consumed in the side reaction. Therefore, before the reaction, chlorine gas firstly passes through a chlorine gas pre-dissolver, gaseous chlorine is dissolved in process water and is fully dissolved in the water to generate hypochlorous acid, and chlorine water dissolved with a large amount of chlorine gas is sent into a chlorohydrin reactor to react with propylene, so that the chlorine gas is prevented from directly contacting with the propylene to generate dichloropropane.
In order to ensure the chlorine dissolving effect, the chlorine is required to be slightly excessive, but the generation amount of side reactants is increased after the chlorine amount is large; similarly, the amount of vaporized propylene entering the chlorohydrination reactor is small, which reduces the reaction speed; the side reaction is accelerated by increasing the amount of propylene. In order to reduce the side reaction and the product thereof as much as possible, the proportion of the propylene and the chlorine is the most important process parameter in the chlorohydrination reaction, and the yield of the chloropropanol as the intermediate product is directly determined.
SUMMERY OF THE UTILITY MODEL
The main purpose of the utility model is to provide a chlorohydrination reaction control system which can effectively reduce side reactions and improve the yield of chloropropanol.
The utility model provides a pair of chlorohydrination reaction control system, include:
the chlorine-propylene ratio regulating system is arranged between the propylene evaporator and the chlorohydrin reactor, and is provided with two air inlet ports and two air outlet ports, wherein the first air inlet port is communicated with the material output end of the propylene evaporator and the material output end of the propylene recovery tower, the second air inlet port is externally connected with chlorine, and the first air outlet port is connected with the material input end of the chlorohydrin reactor, and the second gas outlet port is connected with the material input end of the chlorine gas pre-dissolver.
Further, the chlorine-propylene ratio regulating system comprises: the on-line analyzer comprises an on-line analyzer, a ratio regulator, a chlorine control loop and a propylene mixed gas control loop; wherein,
the online analyzer is used for analyzing the components and the content of the propylene mixed gas;
the ratio regulator is used for regulating the molar ratio of the propylene mixed gas to the chlorine gas to be maintained at 1.6-1.7 according to the components and the content of the on-line analyzer, and regulating the flow of the propylene mixed gas conveyed by the propylene mixed gas control loop according to the flow of the chlorine gas control loop;
the chlorine control loop comprises a chlorine flow regulator, a chlorine regulating valve and a chlorine flow transmitter which are connected in sequence;
the propylene mixed gas control loop comprises a propylene mixed gas flow regulator, a propylene regulating valve and a propylene flow transmitter which are connected in sequence;
the chlorine control loop and the propylene mixed gas control loop are connected through the ratio regulator.
Further, the on-line analyzer is set as an on-line process gas chromatograph.
Further, the chlorine flow regulator is a PI regulator, the chlorine regulating valve is a pneumatic diaphragm valve, and the chlorine flow transmitter is a differential pressure type vortex flow transmitter.
Further, the propylene mixture gas flow regulator is a PI regulator, the propylene regulating valve is a pneumatic film plunger type single-seat regulating valve, and the propylene flow transmitter is a vortex flow transmitter.
The utility model provides a chlorohydrination reaction control system is through setting up a chlorine-propylene ratio governing system in the chlorohydrination reaction for the average mole of propylene mist keeps 1.6-1.7 with the average mole's of chlorine ratio, and the effectual emergence that has reduced side reaction has improved the output rate of chlorohydrination reactant chloropropanol.
Drawings
FIG. 1 is a flow chart of chlorohydrination reaction of the chlorohydrination reaction control system of the present invention;
FIG. 2 is a schematic diagram of a chlorine-propylene ratio adjusting system of the chlorohydrination reaction control system of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings.
The chlorohydrination reaction control system shown in figure 1 comprises a propylene evaporator, a chlorine pre-dissolver, a chlorohydrin reactor, a propylene recovery tower and a chlorohydrin separator, wherein a material input end of the chlorohydrin reactor is respectively communicated with a material output end of the propylene evaporator, a material output end of the chlorine pre-dissolver and a material output end of the propylene recovery tower, a material output end of the chlorohydrin reactor is communicated with a material input end of the chlorohydrin separator, a chlorine-propylene ratio regulating system is arranged between the propylene evaporator and the chlorohydrin reactor and provided with two air inlet ports and two air outlet ports, wherein a first air inlet port is communicated with the material output end of the propylene evaporator and the material output end of the propylene recovery tower, and a second air inlet port is externally connected with chlorine, the first outlet port is connected with the material input end of the chlorohydrin reactor, and the second outlet port is connected with the material input end of the chlorine gas pre-dissolver. In the control process, the chlorine-propylene ratio adjusting system controls the proportion of chlorine and propylene by adjusting the flow rate of a chlorine and propylene mixed gas (pure propylene gas and recovered reaction tail gas).
The propylene is conveyed to a propylene evaporator from a propylene spherical tank pipeline, the propylene is mixed with the recovered propylene to form a propylene mixed gas after being vaporized by adjusting the gas pressure, the propylene mixed gas and the external chlorine gas pass through the chlorine gas-propylene ratio adjusting system, and the flow rate of the propylene mixed gas is adjusted according to the flow rate of the chlorine gas, so that the molar ratio of the propylene mixed gas to the chlorine gas is kept between 1.6 and 1.7. The chlorine gas output by the chlorine gas-propylene ratio adjusting system enters the chlorine gas pre-dissolver to be dissolved and then enters the chlorohydrination reactor, and the output propylene mixed gas enters the chlorohydrination reactor to carry out chlorohydrination reaction, wherein the reaction formula is as follows:
CL2+H2o → HCLO (hypochlorous acid) + HCL
CH3CHCH2+ HCLO (hypochlorous acid) → CH3CHOHCH2CL (. beta. -chloropropanol) + CH3CHCLCH2OH (alpha-chloropropanol)
And (3) allowing the chloropropanol solution generated by the reaction to enter a chloropropanol separator for gas-liquid separation, and allowing the chloropropanol solution to enter a chloropropanol buffer tank from the bottom of the chloropropanol separator for use in a saponification process. In addition, the tail gas of the chlorohydrin reactor enters a first alkaline washing tower, acid mist is washed away, and then the gas is cooled. Most of the cooled gas enters a propylene recovery tower, and the recovered propylene is mixed with fresh propylene again. The cooled liquid and the gas after propylene recovery in the propylene recovery tower enter an alkali liquor circulation tank. The gas after the propylene is recovered by the propylene recovery tower, mainly inert gases such as propane, oxygen, nitrogen and the like which do not react, and a small amount of excessive propylene enter from the bottom of the second alkaline washing tower, and after acid mist and chlorine possibly brought out are washed by alkali, the gas is cooled, separated from gas and liquid, and emptied.
As shown in FIG. 2, the chlorohydrination reaction control system includes: the on-line analyzer comprises an on-line analyzer, a ratio regulator, a chlorine control loop and a propylene mixed gas control loop; wherein,
the online analyzer is used for analyzing the components and the content of the propylene mixed gas; the on-line analysis of the propylene mixed gas components can be carried out by using a process gas chromatograph model GC8 from the Japan Cross river company. The propylene mixed gas is analyzed by a GC8 type process gas chromatograph to obtain the component data (propylene, propane, hydrogen, oxygen and other gases) of the propylene mixed gas, and the average molecular weight of the propylene mixed gas is calculated.
The ratio regulator is used for regulating the molar mass ratio of the propylene mixed gas to the chlorine gas to be maintained at 1: 1.7 according to the components and the content of the on-line analyzer, and controlling the flow rate of the chlorine gas control loop to be 1.6-1.7 relative to the flow rate of the propylene mixed gas conveyed by the propylene mixed gas control loop;
the chlorine control loop comprises a chlorine flow regulator, a regulating valve and a chlorine flow transmitter which are connected in sequence; the chlorine regulator adopts PI regulation law, the chlorine flow transmitter adopts a differential pressure type vortex flow transmitter, and the chlorine regulating valve adopts a pneumatic diaphragm valve. Preferably, the chlorine flow object is further subjected to temperature and pressure compensation by a temperature and pressure compensator for external interference.
The propylene mixed gas control loop comprises a propylene mixed gas flow regulator, a propylene regulating valve and a propylene flow transmitter which are connected in sequence; the propylene mixed gas flow regulator adopts a PI regulation rule, and the propylene flow transmitter adopts a vortex flow transmitter and a pneumatic film plunger type single-seat regulating valve of the propylene regulating valve. The external disturbance to the propylene mixture gas flow object can be compensated by the Pt100 thermal resistance transducer and the capacitance pressure transducer.
The chlorine control loop and the propylene mixed gas control loop are connected through the ratio regulator.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (5)
1. A chlorohydrination reaction control system comprises a propylene evaporator, a chlorine pre-dissolver, a chlorohydrin reactor, a propylene recovery tower and a chlorohydrin separator, wherein a material input end of the chlorohydrin reactor is respectively communicated with a material output end of the propylene evaporator, a material output end of the chlorine pre-dissolver and a material output end of the propylene recovery tower, and a material output end of the chlorohydrin reactor is communicated with a material input end of the chlorohydrin separator, and the chlorohydrin reaction control system is characterized in that a chlorine-propylene ratio regulating system is arranged at the material input end of the chlorine pre-dissolver between the propylene evaporator and the chlorohydrin reactor, and is provided with two air inlet ports and two air outlet ports, wherein a first air inlet port is communicated with the material output end of the propylene evaporator and the material output end of the propylene recovery tower, the second gas inlet port is externally connected with chlorine, the first gas outlet port is connected with the material input end of the chlorohydrin reactor, and the second gas outlet port is connected with the material input end of the chlorine pre-dissolver.
2. The chlorohydrination reaction control system of claim 1, wherein the chlorine-to-propylene ratio adjustment system comprises: the on-line analyzer comprises an on-line analyzer, a ratio regulator, a chlorine control loop and a propylene mixed gas control loop; wherein,
the online analyzer is used for analyzing the components and the content of the propylene mixed gas;
the ratio regulator is used for regulating the molar mass ratio of the propylene mixed gas to the chlorine gas to be maintained at 1: 1.7 according to the components and the content of the on-line analyzer, and controlling the flow rate of the chlorine gas control loop to be 1.6-1.7 relative to the flow rate of the propylene mixed gas conveyed by the propylene mixed gas control loop;
the chlorine control loop comprises a chlorine flow regulator, a chlorine regulating valve and a chlorine flow transmitter which are connected in sequence;
the propylene mixed gas control loop comprises a propylene mixed gas flow regulator, a propylene regulating valve and a propylene flow transmitter which are connected in sequence;
the chlorine control loop and the propylene mixed gas control loop are connected through the ratio regulator.
3. The chlorohydrination reaction control system of claim 1, wherein the on-line analyzer is configured as an on-line process gas chromatograph.
4. The chlorohydrination reaction control system of claim 1, wherein the chlorine flow regulator is a PI regulator, the chlorine regulating valve is a pneumatic diaphragm valve, and the chlorine flow transmitter is a differential pressure vortex flow transmitter.
5. The chlorohydrination reaction control system of claim 1, wherein the propylene mixture flow regulator is a PI regulator, the propylene regulating valve is a pneumatic diaphragm plug type single seat regulating valve, and the propylene flow transmitter is a vortex flow transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202287747U CN201762268U (en) | 2010-06-18 | 2010-06-18 | Chlorohydrination reaction control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202287747U CN201762268U (en) | 2010-06-18 | 2010-06-18 | Chlorohydrination reaction control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201762268U true CN201762268U (en) | 2011-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202287747U Expired - Fee Related CN201762268U (en) | 2010-06-18 | 2010-06-18 | Chlorohydrination reaction control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN201762268U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607024A (en) * | 2014-12-23 | 2015-05-13 | 中国天辰工程有限公司 | Treatment method of acid-containing tail gas of chlorohydrination reaction |
-
2010
- 2010-06-18 CN CN2010202287747U patent/CN201762268U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607024A (en) * | 2014-12-23 | 2015-05-13 | 中国天辰工程有限公司 | Treatment method of acid-containing tail gas of chlorohydrination reaction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110316 Termination date: 20110618 |