CN102527186B - Technology and system for recycling solvent oil from oil gas of butadiene prepared from butane under oxidative dehydrogenation effect - Google Patents
Technology and system for recycling solvent oil from oil gas of butadiene prepared from butane under oxidative dehydrogenation effect Download PDFInfo
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Abstract
The invention relates to a technology and a system for recycling solvent oil from oil gas of butadiene prepared from butane under an oxidative dehydrogenation effect. The technology comprises the following steps: 1) utilizing a fine oil gas filter to filter a catalyst in the oil gas and utilizing an oil gas cooler to cool the oil gas; 2) causing the cooled oil gas to enter into an adsorption/desorption device, adsorbing the solvent oil in the oil gas, and desorbing after fully adsorbing, thereby obtaining desorbed gas of the solvent oil; and 3) separating the solvent oil from the desorbed gas of the solvent oil by utilizing a separating jar, recycling and reusing. The recycling system comprises a preprocessing system, an adsorption/desorption system and a recycling device, wherein the adsorption/desorption system is capable of alternately adsorbing and desorbing or adsorbing, desorbing and drying. The technology has the advantages that the technology is simple; the operation is convenient; the recycling rate of the solvent oil is high; the emission concentration of the oil gas is low; the potential safety hazard is eliminated; the emission load of the oil gas is controlled; the clean production, energy saving and environmental protection are realized; the whole recycling process is continuous; the adsorption efficiency is increased; the solvent oil is recycled from the oil gas; the solvent oil is reused; and the production cost of the butadiene is saved.
Description
Technical field
The present invention relates to solvent oil recovering process and system in a kind of Oxidative Dehydrogenation of Butene into Butadiene oil gas.
Background technology
Butadiene is for the production of elastomeric important source material, and the butadiene of take is produced synthetic rubber as raw material and accounted for the more than 80% of synthetic rubber total output, and along with the increase of rubber demand, the market demand of butadiene expands rapidly.
Butylene oxidation-dehydrogenation is one of main method of producing butadiene, but in dehydrogenation unit, absorb tower top and can produce a large amount of oil gas, the main component of oil gas is water, nitrogen, oxygen, carbon monoxide, carbon dioxide, dimethyl pentane, trimethylpentane and n-hexane, the solvent naphtha that contains a large amount of butadiene dehydrogenation unit absorption tower.Existing oil gas processing mode has two kinds: a kind of is to be directly discharged in atmosphere, and another kind is to be discharged in atmosphere after the nitrogen reclaiming in oil gas, and the nitrogen after reclaiming is as the thick nitrogen in industrial production.These two kinds of methods are contaminated environment not only, is detrimental to health, and also can produce potential safety hazard, and cause energy waste simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide and a kind ofly reduces environmental pollution, eliminates safe hidden trouble, reduces solvent oil recovering process and system in the Oxidative Dehydrogenation of Butene into Butadiene oil gas of energy waste.
Technical solution of the present invention is:
A solvent oil recovering process in Oxidative Dehydrogenation of Butene into Butadiene oil gas, its concrete steps are as follows:
1) oil gas pretreatment
Adopt oil gas accurate filter to filter the catalyst in oil gas, and with oil gas cooler, oil gas is lowered the temperature;
2) adsorption and desorption
The oil gas of cooling enters absorption/desorption equipment, and described absorption/desorption equipment comprises that at least two are assembled with the absorber of adsorbent, and adsorbent adsorbs solvent naphtha in oil gas, adsorbs after saturated and carries out desorption, obtains solvent naphtha desorption gas;
3) reclaim
Solvent naphtha desorption gas is isolated solvent naphtha by knockout drum, recycling.
Solvent oil recovering process in above-mentioned Oxidative Dehydrogenation of Butene into Butadiene oil gas, described adsorbent is a kind of in active carbon, silica gel, carbon fiber.
Solvent oil recovering process in above-mentioned Oxidative Dehydrogenation of Butene into Butadiene oil gas utilizes vavuum pump to form negative-pressure vacuum desorption when desorption, and absorption/desorption equipment comprises two groups of absorbers, two groups of absorbers adsorption and desorption that hockets, solvent naphtha desorption gas enters knockout drum and carries out gas-liquid separation, liquid is discharged from knockout drum lower part outlet, gas is that solvent naphtha gas enters into solvent naphtha absorption tower from the top outlet of knockout drum, solvent naphtha absorbing tower base solvent oil is sent agent oil-absorption tower tower top by solvent naphtha circulating pump back to after the cooling of solvent naphtha recirculation cooler, tower top by the solvent naphtha after lowering the temperature with enter solvent naphtha absorption tower solvent naphtha gas and meet, the cold and hot solvent naphtha liquid that exchanges to obtain, at the bottom of flowing into tower, between solvent naphtha recirculation cooler and solvent naphtha circulating pump, be provided with and extract mouth out, solvent naphtha is evacuated to recovery tower.
Solvent oil recovering process in above-mentioned Oxidative Dehydrogenation of Butene into Butadiene oil gas, when desorption, utilize steam to carry out steam desorption, absorption/desorption equipment comprises three groups of absorbers, three groups of absorbers hocket adsorption and desorption with dry, solvent naphtha in the oil gas of cooling obtains Purge gas after being adsorbed agent absorption, Purge gas enters drying air fan by pipeline, and the adsorbent after utilizing the Purge gas enter in drying air fan to desorption is dried, and dried gas discharging enters atmosphere, solvent naphtha desorption gas enters condensation in desorption gas condenser, the desorption gas of condensation enters in gun barrel and utilizes the water character immiscible with solvent naphtha to carry out separated, the water of lower floor is directly discharged from gun barrel bottom dehydration bag, the solvent on upper strata is transported to solvent naphtha dehydrating tower by solvent oil pump by solvent naphtha, the gas at solvent naphtha dehydrating tower top enters solvent naphtha return tank through solvent naphtha condenser and carries out the separated of solvent naphtha and water, water is discharged from the dehydration bag of solvent naphtha return tank, solvent naphtha is sent circulation in solvent naphtha dehydrating tower back to by solvent naphtha reflux pump and is purified, purification solvent naphtha is recycled to solvent naphtha recovery tower at the bottom of tower, adopt the moisture of the dry desorbing agent of purified gas, make full use of the energy and effectively improved the purification efficiency of installing.
Solvent oil recovery system in a kind of Oxidative Dehydrogenation of Butene into Butadiene oil gas, comprise pretreatment system, absorption/desorption system and recovery system, its special character is: described pretreatment system comprises oil gas accurate filter and oil gas cooler, described absorption/desorption system comprises that vavuum pump and two is assembled with the absorber of adsorbent, and two groups of absorbers coordinate the vavuum pumps adsorption and desorption that can hocket; Described retracting device comprise knockout drum, solvent naphtha absorption tower, with the solvent naphtha circulating pump being connected at the bottom of solvent naphtha absorbing tower, be arranged on the solvent naphtha recirculation cooler between solvent naphtha circulating pump and solvent naphtha absorption tower tower top, between solvent naphtha recirculation cooler and solvent naphtha circulating pump, be provided with and extract mouth out.
Solvent oil recovery system in a kind of Oxidative Dehydrogenation of Butene into Butadiene oil gas, comprise pretreatment system, absorption/desorption system and retracting device, its special character is: described pretreatment system comprises oil gas accurate filter and oil gas cooler, described absorption/desorption system comprises that drying air fan and three is assembled with the absorber of adsorbent, and three groups of absorbers coordinate the drying air fans adsorption and desorption, dry that can hocket; Described retracting device comprises desorption gas condenser, knockout drum, solvent oil pump, solvent naphtha dehydrating tower, the solvent naphtha condenser and the solvent naphtha reflux pump that are separately positioned on solvent naphtha dehydration column overhead are provided with solvent naphtha return tank between solvent naphtha condenser and solvent naphtha reflux pump.
The invention has the beneficial effects as follows:
(1) technique is simple, easy and simple to handle, the solvent naphtha rate of recovery is high, concentration of oil and gas discharged is low, has eliminated potential safety hazard, controls the discharge capacity of oil gas, realizes cleaner production, energy-conserving and environment-protective.
(2) adopt the cooling oil gas of oil gas cooler, the solvent naphtha in oil gas is more easily adsorbed in adsorbent.
(3) adopt the absorption that hockets of many group absorbers, having guaranteed that adsorption process is continual carries out, and makes whole removal process continuous, has improved adsorption efficiency.
(4) recovered solvent oil from oil gas, recycles solvent naphtha, has saved the production cost of butadiene.
Accompanying drawing explanation
Fig. 1 is the recovery system schematic diagram of vacuum desorption of the present invention;
Fig. 2 is the recovery system schematic diagram of steam desorption of the present invention;
In figure: I-pretreatment system: 1-oil gas accurate filter, 2-oil gas cooler; II-absorption/desorption system: 3-absorption/desorption equipment, 301-absorber I, 302-absorber II, 303-absorber III, 4-vavuum pump; III-recovery system: 5-knockout drum, 6-solvent naphtha absorption tower, 7-solvent naphtha circulating pump, 8-solvent naphtha recirculation cooler; 9-drying air fan; 10-desorption gas condenser, 11-gun barrel, 12-solvent oil pump, 13-solvent naphtha dehydrating tower, 14-solvent naphtha condenser, 15-solvent naphtha return tank, 16-solvent naphtha reflux pump.
The specific embodiment
embodiment 1
As shown in Figure 1, solvent naphtha vacuum desorption recovery system in this Oxidative Dehydrogenation of Butene into Butadiene oil gas, comprises pretreatment system I, absorption/desorption system II and retracting device III.Described pretreatment system I comprises oil gas accurate filter 1 and oil gas cooler 2; Described absorption/desorption system II comprises absorption/desorption equipment 3 and vavuum pump 4, and absorption/desorption equipment 3 is comprised of interior absorber I301, the absorber II302 that establishes adsorbent, and absorber I301, absorber II302 coordinate vavuum pump 4 adsorption and desorption that can hocket; Described retracting device III comprises knockout drum 5, solvent naphtha absorption tower 6, with the solvent naphtha circulating pump 7 being connected at the bottom of 6 towers of solvent naphtha absorption tower, be arranged on the solvent naphtha recirculation cooler 8 between solvent naphtha circulating pump 7 and solvent naphtha absorption tower 6 tower tops, between solvent naphtha recirculation cooler 8 and solvent naphtha circulating pump 7, be provided with and extract mouth out.
In this Oxidative Dehydrogenation of Butene into Butadiene oil gas, solvent naphtha vacuum desorption recovery process concrete steps are as follows:
1) pretreatment system I carries out pretreatment
The oil gas that Oxidative Dehydrogenation of Butene into Butadiene dehydrogenation unit absorbs tower top discharge enters oil gas accurate filter 1 and filters catalyst granules in oil gas, then enters with the oil gas cooler 2 that recirculated water is made cooling medium and makes oil gas cooling.
2) absorption/desorption system II carries out adsorption and desorption
The oil gas of cooling enters by the absorber I301 that acticarbon is housed, absorption/desorption equipment 3 that absorber I302 forms, the import magnetic valve that absorber I301 is corresponding is opened, in the absorber I301 that first oil gas enter, adsorb, solvent naphtha in oil gas is obtained Purge gas by charcoal absorption, Purge gas directly enters atmosphere, after charcoal absorption solvent naphtha is saturated, the import closed electromagnetic valve that absorber I301 is corresponding, the outlet magnetic valve that absorber I301 is corresponding is opened, vavuum pump 4 forms negative pressure and carries out vacuum desorption desorption is out from active carbon by solvent naphtha, obtain solvent naphtha desorption gas, during absorber I301 desorption, the corresponding import magnetic valve of absorber II302 is opened, oil gas continues to enter in the absorber II302 that acticarbon is housed and adsorbs, by solenoid control, make absorber I301, the absorber II302 absorption that hockets, desorption, according to the flow of oil gas, obtain the opening and closing that the saturated required time of charcoal absorption solvent naphtha is set magnetic valve.
3) recovery system III reclaims
Solvent naphtha desorption gas enters knockout drum 5 and carries out gas-liquid separation, liquid is discharged from knockout drum 5 lower part outlets, gas is that solvent naphtha gas enters into solvent naphtha absorption tower 6 from the top outlet of knockout drum 5, solvent naphtha absorption tower 6 tower base solvent oil are sent agent oil-absorption tower 6 tower tops by solvent naphtha circulating pump 7 back to after 8 coolings of solvent naphtha recirculation cooler, tower top by the solvent naphtha after lowering the temperature with enter solvent naphtha absorption tower 6 solvent naphtha gases and meet, the cold and hot solvent naphtha liquid that exchanges to obtain, at the bottom of flowing into tower, between solvent naphtha recirculation cooler 8 and solvent naphtha circulating pump 9, be provided with and extract mouth out, solvent naphtha is evacuated to recovery tower.
In the oil gas that in existing 100,000 tons/year of Oxidative Dehydrogenation of Butene into Butadiene projects, dehydrogenation unit absorption tower tower top discharges, the loss that causes solvent naphtha is 660kg/h, set up in the oil gas of the present embodiment after solvent oil recovery system, the yield of solvent naphtha is 600kg/h, the loss of solvent naphtha is reduced to 60kg/h, and annual recovered solvent oil can reach 4800t, greatly reduces the discharge capacity of oil gas, energy-conserving and environment-protective, have realized cleaner production.
embodiment 2
Adsorbent in embodiment 1 is replaced to carbon fiber, and technical process is with embodiment 1.
embodiment 3
Adsorbent in embodiment 1 is replaced to silica gel, and technical process is with embodiment 1.
embodiment 4
As shown in Figure 2, in this butadiene production, oil gas steam desorption recovered solvent oil system comprises pretreatment system I, absorption/desorption system II and retracting device III, described pretreatment system I comprises oil gas accurate filter 1 and oil gas cooler 2, described absorption/desorption system II comprises absorption/desorption equipment 3 and drying air fan 9, adsorption/desorption equipment is comprised of absorber I301, absorber I302, the absorber III303 of in-built adsorbent, coordinates drying air fan 9 adsorption and desorption, dry that can hocket.Described retracting device III comprises desorption gas condenser 10, gun barrel 11, solvent oil pump 12, solvent naphtha dehydrating tower 13, the solvent naphtha condenser 14 and the solvent naphtha reflux pump 15 that are contained in respectively solvent naphtha dehydrating tower 13 tower tops, be located at the solvent naphtha return tank 16 between solvent naphtha condenser 14 and solvent naphtha reflux pump 15.
In this butadiene production, oil gas steam desorption recovered solvent oil technique concrete steps are as follows:
1) pretreatment system I carries out pretreatment
Oxidative Dehydrogenation of Butene into Butadiene dehydrogenation unit absorbs oil gas that tower top produces and enters oil gas accurate filter 1 and filter catalyst granules in oil gas, then enters with the oil gas cooler 2 that recirculated water is made cooling medium and makes oil gas cooling.
2) absorption/desorption system II carries out adsorption and desorption
The oil gas of cooling enters by the absorber I301 that acticarbon is housed, absorber II302, absorption/desorption equipment 3 that absorber III303 forms, the import magnetic valve that absorber I301 is corresponding is opened, first oil gas enter in absorber I301 and adsorb, solvent naphtha in oil gas is obtained Purge gas by charcoal absorption, Purge gas enters drying air fan 9 by pipeline, after charcoal absorption solvent naphtha is saturated, the import closed electromagnetic valve that absorber I301 is corresponding, the outlet magnetic valve that absorber I301 is corresponding is opened, utilize steam solvent naphtha to be carried out from active carbon to steam desorption, obtain solvent naphtha desorption gas, during absorber I301 desorption, the import magnetic valve that absorber II302 is corresponding is opened, oil gas continues to enter in absorber II302 and adsorbs, in absorber II302 charcoal absorption solvent naphtha saturated after, the import closed electromagnetic valve that absorber II302 is corresponding, the outlet magnetic valve that absorber II302 is corresponding is opened, and utilizes steam solvent naphtha to be carried out from active carbon to steam desorption, obtains solvent naphtha desorption gas, during absorber II302 desorption, the import magnetic valve that absorber III303 is corresponding is opened, oil gas continues to enter in absorber III303 and adsorbs, active carbon after absorber I301 utilizes the Purge gas enter in drying air fan 9 to desorption is dried, dried gas discharging enters atmosphere, by solenoid control, make absorber I301, absorber II302, the absorber III303 adsorption and desorption, dry that hockets, according to the flow of oil gas, obtain the opening and closing that the saturated required time of charcoal absorption solvent naphtha is set magnetic valve.
3) recovery system III reclaims
Solvent naphtha desorption gas enters condensation in desorption gas condenser 10, the desorption gas of condensation enters in gun barrel 11 and utilizes the water character immiscible with solvent naphtha to carry out separated, the water of lower floor is directly discharged from gun barrel 11 bottom dehydration bags, the solvent on upper strata is transported to solvent naphtha dehydrating tower 13 by solvent oil pump 12 by solvent naphtha, the gas at solvent naphtha dehydrating tower 13 tops enters solvent naphtha return tank 15 through solvent naphtha condenser 14 and carries out the separated of solvent naphtha and water, water is discharged from the dehydration bag of solvent naphtha return tank 15, solvent naphtha is sent circulation in solvent naphtha dehydrating tower 13 back to by solvent naphtha reflux pump 16 and is purified, purification solvent naphtha is recycled to solvent naphtha recovery tower at the bottom of tower.
In the oil gas that in existing 100,000 tons/year of Oxidative Dehydrogenation of Butene into Butadiene projects, dehydrogenation unit absorption tower tower top discharges, the loss that causes solvent naphtha is 660kg/h, increased in the oil gas of the present embodiment after solvent oil recovery system, the yield of solvent naphtha is 600kg/h, the loss of solvent naphtha is reduced to 60kg/h, and annual recovered solvent oil can reach 4800t, greatly reduces the discharge capacity of oil gas, energy-conserving and environment-protective, have realized cleaner production.
embodiment 5
Adsorbent in embodiment 4 is replaced to carbon fiber, and technical process is with embodiment 4.
embodiment 6
Adsorbent in embodiment 4 is replaced to silica gel, and technical process is with embodiment 4.
Claims (4)
1. a solvent oil recovering process in Oxidative Dehydrogenation of Butene into Butadiene oil gas, is characterized in that, step is as follows:
1) oil gas pretreatment
Adopt oil gas accurate filter to filter the catalyst in oil gas, and with oil gas cooler, oil gas is lowered the temperature;
2) adsorption and desorption
The oil gas of cooling enters absorption/desorption equipment, and described absorption/desorption equipment comprises that two are assembled with the absorber of adsorbent, and adsorbent adsorbs solvent naphtha in oil gas, adsorbs after saturated and carries out desorption, obtains solvent naphtha desorption gas; Described adsorbent is a kind of in active carbon, silica gel, carbon fiber;
When desorption, utilize vavuum pump to form negative-pressure vacuum desorption, two groups of absorbers adsorption and desorption that hockets, solvent naphtha desorption gas enters knockout drum and carries out gas-liquid separation, liquid is discharged from knockout drum lower part outlet, gas is that solvent naphtha gas enters into solvent naphtha absorption tower from the top outlet of knockout drum, solvent naphtha absorbing tower base solvent oil is sent solvent naphtha absorption tower tower top by solvent naphtha circulating pump back to after the cooling of solvent naphtha recirculation cooler, tower top is met by the solvent naphtha after lowering the temperature and the solvent naphtha gas that enters solvent naphtha absorption tower, the cold and hot solvent naphtha liquid that exchanges to obtain, at the bottom of flowing into tower, between solvent naphtha recirculation cooler and solvent naphtha circulating pump, be provided with and extract mouth out, solvent naphtha is evacuated to solvent naphtha recovery tower,
3) reclaim
Solvent naphtha desorption gas is isolated solvent naphtha by knockout drum, recycling.
2. a solvent oil recovering process in Oxidative Dehydrogenation of Butene into Butadiene oil gas, is characterized in that, step is as follows:
1) oil gas pretreatment
Adopt oil gas accurate filter to filter the catalyst in oil gas, and with oil gas cooler, oil gas is lowered the temperature;
2) adsorption and desorption
The oil gas of cooling enters absorption/desorption equipment, and described absorption/desorption equipment comprises that three are assembled with the absorber of adsorbent, and adsorbent adsorbs solvent naphtha in oil gas, adsorbs after saturated and carries out desorption, obtains solvent naphtha desorption gas;
Described adsorbent is a kind of in active carbon, silica gel, carbon fiber;
When desorption, utilize steam to carry out steam desorption, three groups of absorbers hocket adsorption and desorption with dry, solvent naphtha in the oil gas of cooling obtains Purge gas after being adsorbed agent absorption, Purge gas enters drying air fan by pipeline, utilization enters Purge gas in the drying air fan adsorbent after to desorption and is dried, and dried gas discharging enters atmosphere, solvent naphtha desorption gas enters condensation in desorption gas condenser, the desorption gas of condensation enters in gun barrel and utilizes the water character immiscible with solvent naphtha to carry out separated, the water of lower floor is directly discharged from gun barrel bottom dehydration bag, the solvent on upper strata is transported to solvent naphtha dehydrating tower by solvent oil pump by solvent naphtha, the gas at solvent naphtha dehydrating tower top enters solvent naphtha return tank through solvent naphtha condenser and carries out the separated of solvent naphtha and water, water is discharged from the dehydration bag of solvent naphtha return tank, solvent naphtha is sent circulation in solvent naphtha dehydrating tower back to by solvent naphtha reflux pump and is purified, purification solvent naphtha is recycled to solvent naphtha recovery tower at the bottom of tower,
3) reclaim
Solvent naphtha desorption gas is isolated solvent naphtha by knockout drum, recycling.
3. solvent oil recovery system in the Oxidative Dehydrogenation of Butene into Butadiene oil gas that a solvent oil recovering process as claimed in claim 1 adopts, comprise pretreatment system, absorption/desorption system and retracting device, it is characterized in that: described pretreatment system comprises oil gas accurate filter and oil gas cooler, described absorption/desorption system comprises that vavuum pump and two is assembled with the absorber of adsorbent, and two groups of absorbers coordinate the vavuum pumps adsorption and desorption that can hocket; Described retracting device comprise knockout drum, solvent naphtha absorption tower, with the solvent naphtha circulating pump being connected at the bottom of solvent naphtha absorbing tower, be arranged on the solvent naphtha recirculation cooler between solvent naphtha circulating pump and solvent naphtha absorption tower tower top, between solvent naphtha recirculation cooler and solvent naphtha circulating pump, be provided with and extract mouth out.
4. solvent oil recovery system in the Oxidative Dehydrogenation of Butene into Butadiene oil gas that a solvent oil recovering process as claimed in claim 2 adopts, comprise pretreatment system, absorption/desorption system and retracting device, it is characterized in that: described pretreatment system comprises oil gas accurate filter and oil gas cooler, described absorption/desorption system comprises that drying air fan and three is assembled with the absorber of adsorbent, and three groups of absorbers coordinate the drying air fans adsorption and desorption, dry that can hocket; Described retracting device comprises desorption gas condenser, knockout drum, solvent oil pump, solvent naphtha dehydrating tower, the solvent naphtha condenser and the solvent naphtha reflux pump that are separately positioned on solvent naphtha dehydration column overhead, be arranged on the solvent naphtha return tank between solvent naphtha condenser and solvent naphtha reflux pump.
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| CN102863309B (en) * | 2012-09-21 | 2014-04-16 | 湖南百利工程科技股份有限公司 | Processing technological method for gas generated in preparation of butadiene through reaction by oxidative dehydrogenation of butene |
| CN103520947B (en) * | 2013-09-29 | 2015-05-13 | 江苏中远环保科技有限公司 | Method and device for recycling multicomponent oil gas separately with condensation method |
| CN111825516B (en) * | 2019-04-19 | 2023-04-28 | 惠生工程（中国）有限公司 | Separation system and separation method of crude butadiene |
| CN111437691A (en) * | 2020-04-01 | 2020-07-24 | 安徽晋煤中能化工股份有限公司 | Organic waste gas treatment method for producing hydrogen peroxide by anthraquinone process |
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