CN102921182A - Composite tower for separating intermediater products of dimethyl oxalate and carbinol in ethylene glycol industrial production - Google Patents
Composite tower for separating intermediater products of dimethyl oxalate and carbinol in ethylene glycol industrial production Download PDFInfo
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- CN102921182A CN102921182A CN2012104307151A CN201210430715A CN102921182A CN 102921182 A CN102921182 A CN 102921182A CN 2012104307151 A CN2012104307151 A CN 2012104307151A CN 201210430715 A CN201210430715 A CN 201210430715A CN 102921182 A CN102921182 A CN 102921182A
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- tower
- ethylene glycol
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- dimethyl oxalate
- methyl alcohol
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Abstract
The invention discloses a composite tower for separating intermediater products of dimethyl oxalate and carbinol in the ethylene glycol industrial production. The composite tower comprises a closed vertical casing with a material inlet, a gas-phase carbinol collection device and a liquid collection device. The vertical casing is divided into an upper portion and a lower portion through a floating valve tower horizontally arranged in the vertical casing. The upper portion is a rectifying section, and the lower portion is a stripping section. Separation structured filler is arranged in the rectifying section, and a stainless steel lining is arranged on the inner wall of the casing of the stripping section. By means of the technical scheme, the portion of the tower above the material inlet is made of carbon steel, and the structured filler is arranged inside to reduce resistance of the tower, improve production efficiency and ensure safe production. Operation pressure of the composite tower is negative pressure and is -0.1- -0.09MPa, and operation temperature of a tower kettle is arranged to be 150-170 DEG C to promote decomposing of oxalate and reduce corrosion. The improved composite tower prolongs online use period and reduces equipment maintenance cost.
Description
Technical field
The invention belongs to the ethylene glycol field of industrial production, more particularly, the present invention relates to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate and methyl alcohol.
Background technology
Indirect method synthesizing glycol technique is 2 footworks, and the first step is first by methyl nitrite and carbon monoxide carbonylation intermediate product dimethyl oxalate, and second step is by hydrogenation of dimethyl oxalate to synthesizing ethylene glycol; The dimethyl oxalate of oxonation device outlet is made of methyl alcohol through aeration tower and is collected after the gas washing medium cleans, and obtains the mixed liquor of dimethyl oxalate and methyl alcohol at the bottom of the tower, mixed liquor to recovery tower with separating methanol, obtain pure dimethyl oxalate at the bottom of the tower.Existing most of synthesis gas preparing ethylene glycol device intermediate product dimethyl oxalate ester will decomposite oxalic acid under the effect of minor amount of water, the compound tower of prior art adopts carbon steel material or common stainless steel mostly, decomposite oxalic acid the tower wall is had corrosiveness, after using a period of time, the liner of tower is changed in the maintenance that will stop production, and this maintain and replace has strengthened production cost, if seriously corroded also can cause the generation of leakage accident.
Summary of the invention
Problem to be solved by this invention provides a kind of reducing production costs, and guarantees the ethylene glycol industrial production isolation of intermediate products dimethyl oxalate of safety in production and the compound tower of methyl alcohol.
To achieve these goals, the technical scheme that the present invention takes is: a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate that provides and the compound tower of methyl alcohol, comprise have charging aperture, the upright shell of the sealing of the gathering-device of gas-phase methanol and liquid collector, horizontally disposed valve tower is divided into two ones up and down with it in the upright shell, top is rectifying section, the bottom is stripping section, be provided with the separation structured packing in the rectifying section section, the stripping section inner walls is provided with stainless liner.
Preferably, valve tower is the double-layer structure of the horizontal positioned that be arranged in parallel.
Preferably, the sidewall of upright shell is provided with charging aperture, and the bottom of charging aperture is near the valve tower on upper strata.
Preferably, the top of upright shell is provided with the gathering-device of gas-phase methanol.
Preferably, the gathering-device of gas-phase methanol is the air collector that the affixed wireway of an end and housing and the wireway other end removably connect.
Preferably, the bottom of upright shell is provided with liquid collector.
Preferably, liquid collector is the catheter of cooler bottom setting and the liquid collecting tank that removably connects with catheter.
Preferably, catheter and liquid collecting tank place also are provided with sleeve pipe companion heat.
Preferably, the pressure of compound tower operation is negative pressure, pressure is-0.1～-0.09MPa.
Preferably, the tower reactor operating temperature is at 150～170 ℃.
Adopt technical scheme of the present invention, the profile of compound tower is the upright shell of sealing, horizontally disposed valve tower is divided into two ones up and down with it in the upright shell, top is rectifying section, and the bottom is stripping section, is provided with efficient separation structured packing in the rectifying section section, the stripping section inner walls is provided with stainless liner, adopt the compound tower of structure of the present invention, can increase production stability, guarantee safety in production; Tower bottom internals are selected two valve towers, the above carbon steel that adopts of tower charging aperture cylindrical shell, and structured packing is used in inside, reduces the resistance of tower, enhances productivity; The overhead extraction gas-phase methanol, gas phase pipe, cooler etc. can use carbon steel equipment, and the liquid collector of extraction dimethyl oxalate at the bottom of the tower all uses pitting corrosion resistance, and the outstanding 316L super-low carbon stainless steel of high temperature resistant, creep-resistant property reduces corrosion; The pressure of compound tower operation is negative pressure, pressure be-0.1～-0.09MPa, the tower reactor operating temperature be at 150～170 ℃, and its purpose is to impel oxalic acid to decompose, and minimizing is corroded; Catheter and liquid collecting tank place also are provided with sleeve pipe companion heat, can enhance productivity; Carry out improvedly on the basis of original equipment through transformed combination tower, cost of investment is low, and the device processes amount after the improvement is large, and separation of products is effective, has improved the production rate; Combination tower after the improvement has prolonged online life cycle, has reduced the maintenance of equipment cost.
Description of drawings
The below briefly explains the expressed content of each width of cloth accompanying drawing of this specification and the mark among the figure:
Fig. 1 is the schematic diagram of the compound tower of a kind of ethylene glycol industrial production of the present invention isolation of intermediate products dimethyl oxalate and methyl alcohol.
Be labeled as among the figure: 1, upright shell; 2, filler; 3, separating reaction section; 4, valve tower; 5, cooler; 6, charging aperture; 7, catheter; 8, liquid collecting tank; 9, wireway; 10, air collector.
The specific embodiment
The below contrasts accompanying drawing, by the description to embodiment, effect and operation principle, manufacturing process and operation using method etc. to the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part, be described in further detail, to help those skilled in the art inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding.
Fig. 1 is the schematic diagram of the compound tower of a kind of ethylene glycol industrial production of the present invention isolation of intermediate products dimethyl oxalate and methyl alcohol; The compound tower of a kind of ethylene glycol industrial production of the present invention as shown in the figure isolation of intermediate products dimethyl oxalate and methyl alcohol, the upright shell 1 that comprises the sealing of gathering-device with charging aperture 6, gas-phase methanol and liquid collector, horizontally disposed valve tower 4 is divided into two ones up and down with it in the upright shell, top is rectifying section 3, the bottom is stripping section 5, be provided with structured packing 2 in the rectifying section 3, cooler 5 inner walls are provided with stainless liner; Valve tower 4 is the double-layer structure of the horizontal positioned that be arranged in parallel; The sidewall of upright shell 1 is provided with charging aperture 6, and the bottom of charging aperture 6 is near the valve tower 4 on upper strata; The top of upright shell 1 is provided with the gathering-device of gas-phase methanol, and the gathering-device of gas-phase methanol is the air collector 10 that the affixed wireway 9 of an end and upright shell 1 and wireway 9 other ends removably connect; The bottom of upright shell 1 is provided with liquid collector, and liquid collector is the catheter 7 of cooler 5 bottoms setting and the liquid collecting tank 8 that removably connects with catheter 7; Catheter 7 and liquid collecting tank 8 places also are provided with sleeve pipe companion heat; Adopt technical scheme of the present invention, the profile of compound tower is the upright shell 1 of sealing, upright shell 1 interior horizontally disposed valve tower 4 is divided into two ones up and down with it, top is separating reaction section 3, and the bottom is cooler 5, is provided with structured packing 2 in the separating reaction section 3, cooler 5 inner walls are provided with stainless liner, adopt the compound tower of structure of the present invention, can increase production stability, guarantee safety in production; Tower bottom internals are selected two valve towers, increase production stability; The above carbon steel that adopts of tower charging aperture 6 cylindrical shells, inner use structured packing, the resistance of reduction tower increases production efficiency; The pressure of compound tower operation is negative pressure, pressure be-0.1～-0.09MPa, the tower reactor operating temperature be at 150～170 ℃, preferably is controlled at 160 ℃, decomposes to impel oxalic acid, minimizing is corroded; The overhead extraction gas-phase methanol, wireway 9, cooler 5 etc. can use carbon steel equipment, extraction dimethyl oxalate at the bottom of the tower, use the part of carbon steel material all to use pitting corrosion resistance, the outstanding 316L super-low carbon stainless steel of high temperature resistant, creep-resistant property, catheter 7 and liquid collecting tank 8 places also are provided with sleeve pipe companion heat, can enhance productivity; Carry out improvedly on the basis of original equipment through transformed combination tower, cost of investment is low, and the device processes amount after the improvement is large, and separation of products is effective, has improved the production rate; Combination tower after the improvement has prolonged online life cycle, has reduced the maintenance of equipment cost.
The above has carried out exemplary description to the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (10)
1. the compound tower of an ethylene glycol industrial production isolation of intermediate products dimethyl oxalate and methyl alcohol, comprise have charging aperture, the upright shell of the sealing of the gathering-device of gas-phase methanol and liquid collector, it is characterized in that: horizontally disposed valve tower is divided into two ones up and down with it in the upright shell, top is rectifying section, the bottom is stripping section, be provided with the separation structured packing in the rectifying section section, the stripping section inner walls is provided with stainless liner.
2. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 1 and methyl alcohol, it is characterized in that: described valve tower is the double-layer structure of the horizontal positioned that be arranged in parallel.
3. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 2 and methyl alcohol, it is characterized in that: described charging aperture is positioned at the sidewall of upright shell, and the bottom of charging aperture is near the valve tower on upper strata.
4. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 1 and methyl alcohol, it is characterized in that: described gas-phase methanol gathering-device is arranged on the top of upright shell.
5. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 4 and methyl alcohol, it is characterized in that: the gathering-device of described gas-phase methanol is the air collector that the affixed wireway of an end and upright shell and the wireway other end removably connect.
6. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 1 and methyl alcohol, it is characterized in that: described liquid collector is arranged on the bottom of upright shell.
7. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 6 and methyl alcohol, it is characterized in that: described liquid collector is the catheter of cooler bottom setting and the liquid collecting tank that removably connects with catheter.
8. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 6 and methyl alcohol, it is characterized in that: described catheter and liquid collecting tank place also are provided with sleeve pipe companion heat.
9. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 1 and methyl alcohol, it is characterized in that: the pressure of compound tower operation is negative pressure, pressure is-0.1～-0.09MPa.
10. according to the compound tower of a kind of ethylene glycol industrial production isolation of intermediate products dimethyl oxalate claimed in claim 1 and methyl alcohol, it is characterized in that: the tower reactor operating temperature is at 150～170 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104307151A CN102921182A (en) | 2012-11-01 | 2012-11-01 | Composite tower for separating intermediater products of dimethyl oxalate and carbinol in ethylene glycol industrial production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104307151A CN102921182A (en) | 2012-11-01 | 2012-11-01 | Composite tower for separating intermediater products of dimethyl oxalate and carbinol in ethylene glycol industrial production |
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| Publication Number | Publication Date |
|---|---|
| CN102921182A true CN102921182A (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104307151A Pending CN102921182A (en) | 2012-11-01 | 2012-11-01 | Composite tower for separating intermediater products of dimethyl oxalate and carbinol in ethylene glycol industrial production |
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| CN (1) | CN102921182A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2643968Y (en) * | 2003-09-17 | 2004-09-29 | 中国成达工程公司 | Combined carbinol rectifying tower |
| CN201423184Y (en) * | 2009-06-09 | 2010-03-17 | 天津天大凯泰化工科技有限公司 | Composite tower used for post-processing of electronic product cleaning solution |
| CN202191708U (en) * | 2011-08-04 | 2012-04-18 | 常州化工设备有限公司 | Pot-type evaporator |
| CN202968431U (en) * | 2012-11-01 | 2013-06-05 | 安徽淮化股份有限公司 | Composite tower for separating intermediate products dimethyl oxalate and methanol in industrial production of ethylene glycol |
-
2012
- 2012-11-01 CN CN2012104307151A patent/CN102921182A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2643968Y (en) * | 2003-09-17 | 2004-09-29 | 中国成达工程公司 | Combined carbinol rectifying tower |
| CN201423184Y (en) * | 2009-06-09 | 2010-03-17 | 天津天大凯泰化工科技有限公司 | Composite tower used for post-processing of electronic product cleaning solution |
| CN202191708U (en) * | 2011-08-04 | 2012-04-18 | 常州化工设备有限公司 | Pot-type evaporator |
| CN202968431U (en) * | 2012-11-01 | 2013-06-05 | 安徽淮化股份有限公司 | Composite tower for separating intermediate products dimethyl oxalate and methanol in industrial production of ethylene glycol |
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Application publication date: 20130213 |