CN209722050U - Oil liquefied gas caustic wash desulfuration equipment - Google Patents

Abstract

A kind of oil liquefied gas caustic wash desulfuration equipment, it is related to oil liquefied gas caustic wash desulfuration technical field, oil liquefied gas is passed through pre-alkali cleaning device and carries out caustic prescrub to liquefied gas, the liquefied gas that hydrogen sulfide is removed after caustic prescrub is passed through level-one extraction device, level-one extraction device carries out level-one extracting to the liquefied gas after caustic prescrub, liquefied gas after level-one is extracted is passed through second level extraction device, liquefied gas after second level extraction device extracts level-one carries out second level extracting, the liquefied gas of removal of mercaptans qualification is passed through water washing device after second level is extracted, liquefied gas after water washing device extracts second level is washed, liquefied gas after washing is passed through liquefied gas dehydration dealkalization device, the water of liquefied gas and alkali abjection are reached liquefied gas refining desulfurization by the liquefied gas dehydration dealkalization device, realize the caustic wash desulfuration of liquefied gas.

Description

Oil liquefied gas caustic wash desulfuration equipment

Technical field

The utility model relates to oil liquefied gas caustic wash desulfuration technical field, in particular to a kind of oil liquefied gas alkali cleaning is de- Sulphur equipment.

Background technique

Presently, there are following problems for oil liquefied gas caustic wash desulfuration: the first, the high-sulfurized tendency aggravation of raw material；The Two, liquefied refinery gas product sulfur content requires lower and lower, to be suitable for the application and increase product competitiveness of downstream unit；The Three, environmental requirement increasingly improves, and the liquefied gas of high sulfur content generates pollution to environment.

As the requirement to environmental protection is increasingly strict, countries in the world are increasingly tighter to the limitation of sulfur content in motor petrol, In the production process of MTBE, MTBE has higher dissolubility, and the boiling point of most sulfide to sulfide than C_4 hydrocarbon High compared with the boiling point of carbon four, therefore, the sulfide overwhelming majority in feed carbon four is enriched in MTBE product, causes MTBE product Sulfur content is high, and therefore, how to reduce the sulfur content in motor petrol is the big project currently faced.

Summary of the invention

In view of this, it is necessary to provide it is a kind of can the oil liquefied gas caustic wash desulfuration to oil liquefied gas caustic wash desulfuration set It is standby.

A kind of oil liquefied gas caustic wash desulfuration equipment, including regenerator, caustic washing system, gas separation unit, catalytic distillation hydrogenation Desulfurizer, the outlet of the regenerator and the inlet communication of caustic washing system, are passed through caustic washing system for oil liquefied gas, described The outlet of caustic washing system and the entrance of gas separation unit connect, and there is the gas separation unit gaseous phase outlet and a liquid phase to go out Mouthful, the liquid-phase outlet of the gas separation unit is connect with the entrance of the catalytic distillation hydrogenation desulfurizer；The caustic washing system packet Include pre-alkali cleaning device, level-one extraction device, second level extraction device, water washing device, liquefied gas dehydration dealkalization device, the caustic prescrub The discharge port of device is connect with the feed inlet of level-one extraction device, and the oil liquefied gas after caustic prescrub is passed through level-one extracting dress It sets, the discharge port of the level-one extraction device is connect with the feed inlet of second level extraction device, the petroleum liquid after level-one is extracted Change gas and be passed through second level extraction device, the discharge port of the second level extraction device and the feed inlet of water washing device connect, by second level Oil liquefied gas after extracting is passed through water washing device, the charging of discharge port and liquefied gas the dehydration dealkalization device of the water washing device Oil liquefied gas after washing is passed through liquefied gas dehydration dealkalization device by mouthful connection, liquefied gas dehydration dealkalization device with The entrance of gas separation unit connects, and the water of liquefied gas and alkali are deviate from and liquefied refinery gas is passed through gas separation unit；The catalysis is steamed Evaporating hydrodesulfurization unit includes methyltertiarvbutyl ether reactor, the first destilling tower, after-fractionating tower, catalytic distillation tower, the first condenser, stripping The outlet of tower, caustic treater, gate valve, reflux pump, the second condenser, the methyltertiarvbutyl ether reactor is connect with the entrance of the first destilling tower, The entrance of first destilling tower outlet at bottom and after-fractionating tower connects, in the middle part of after-fractionating tower outlet at bottom and catalytic distillation tower Entrance connection is additionally provided with hydrogen inlet, the outlet of after-fractionating top of tower and entering for the first condenser in catalytic distillation tower lower part Mouth connection, the outlet of the first condenser and the entrance of stripper connect, and the outlet of stripper top and the entrance of caustic treater connect, Gate valve is installed on the discharge pipe of stripper outlet at bottom, the entrance of the reflux pump is connected to discharge pipe, reflux pump with Discharge pipe junction is between stripper outlet at bottom and gate valve, the outlet of reflux pump and returning for catalytic distillation tower middle and upper part Head piece connection, the outlet of catalytic distillation tower bottom is connect with the entrance of the second condenser.

Preferably, the bottom of the regenerator is provided with the first air inlet, the second air inlet, the setting of regenerator intracavity bottom There are six distributor pipes, and the distributor pipe is uniformly distributed from left to right, and the main air blower has a main wind entrance and a main wind outlet, The main wind outlet is connected to the first air inlet, the second air inlet, to be entered the wind extraneous air from first by main air blower Mouth, the second air inlet are passed through in regenerator, the first air inlet and three, left side distributor pipe, the second air inlet and the distribution of three, right side Pipe connection, to divide two-way to be uniformly passed through regenerator the air feed of main air blower by three, left side distributor pipe, three, right side distributor pipe It is interior, uniformly to provide oxygen for catalyst in regenerator.

Preferably, the catalytic distillation hydrogenation desulfurizer further includes extraction tower, methanol column, going out at the top of the first destilling tower Mouth is connect with the entrance of extraction tower, and the entrance of the outlet and methanol column that extract tower bottom connects, from upper in first destilling tower It is divided into rectifying section, conversion zone, stripping section under and, the outlet at the top of methanol column and the methanol inlet of the first distillation column reaction section connect It connects, the outlet at the top of methanol column is also connect with the entrance of methyltertiarvbutyl ether reactor.

Preferably, the catalytic distillation hydrogenation desulfurizer further includes microprocessor and the quality that connect with microprocessor Flowmeter, flow instrument, the mass flowmenter are mounted between the first destilling tower outlet at bottom and the entrance of after-fractionating tower On pipeline, the flow instrument is mounted on the pipeline of after-fractionating tower top exit, and the mass flowmenter enters for controlling The inlet amount of after-fractionating tower, flow instrument are used for real-time detection after-fractionating tower produced quantity, inspection of the microprocessor according to flow instrument The produced quantity of survey is calculated according to algorithm is prestored, and calculated result is fed back to mass flowmenter, to pass through mass flowmenter Control after-fractionating tower inlet amount.

Preferably, it is produced quantity to be substituted into following formula to calculate, and then calculate that algorithm is prestored in the microprocessor Inlet amount, D/F=A, wherein D is produced quantity, and unit is cube m/h；F is inlet amount, and unit is cube m/h；A is Constant.

Preferably, the pre-alkali cleaning device include caustic prescrub settling tank, it is catalytic unit alkaline residue tank, caustic prescrub mixer, pre- Alkali cleaning Venturi tube, the feed inlet of the caustic prescrub settling tank is connect with extraneous apparatus for feeding, into caustic prescrub settling tank It is passed through liquefied petroleum gas, new lye, the bottom end of the caustic prescrub settling tank connect with catalytic unit alkaline residue tank, alkaline residue is arranged Out, the top of the caustic prescrub settling tank is separately connected with caustic prescrub mixer, caustic prescrub Venturi tube.

Preferably, the level-one extraction device includes that level-one extracting settling tank, rich extractant collection device, level-one extracting are mixed The feed inlet of clutch, the level-one extracting settling tank is connect with the discharge port of caustic prescrub settling tank, so that level-one extracts settling tank The bottom end of liquefied gas after being inside passed through caustic prescrub, the level-one extracting settling tank is connect with rich extractant collection device, will be rich Extractant flows into rich extractant collection device, and the top of the level-one extracting settling tank is connect with level-one extracting mixer.

Preferably, the second level extraction device includes second level extracting settling tank, poor extractant feeding device, half poor extractant Pump, second level extract mixer, and the feed inlet of the second level extracting settling tank is connect with the discharge port of level-one extracting settling tank, so that Be passed through the liquefied gas after level-one extracting in second level extracting settling tank, the feed inlet of second level extracting settling tank also with poor extractant The discharge port of feeding device connects, so as to poor extractant is passed through in second level extracting settling tank, the bottom of the second level extracting settling tank It holds and is connect with the feed inlet of half poor extractant pump, half poor extractant is pumped into half poor extractant and is pumped, the half poor extractant pump The feed inlet of discharge port and level-one extracting settling tank connect, half poor extractant is pumped into level-one and extracts settling tank, described two The top of grade extracting settling tank is connect with second level extracting mixer.

Preferably, the water washing device includes washing precipitation tank, washing water injecting pump, washing Venturi tube, and the washing is heavy The feed inlet for dropping tank is connect with the discharge port of second level extracting settling tank, so as to be passed through the liquefaction after second level extracting in washing precipitation tank Gas, the feed inlet of the washing precipitation tank is also connect with washing water injecting pump, so as to be passed through water in washing precipitation tank, the washing is heavy The bottom end for dropping tank is connect with extraneous water treatment system, alkaline water, the top of the washing precipitation tank and washing text is discharged Venturi connection.

Preferably, the liquefied gas dehydration dealkalization device includes liquefaction sand tower, regenerative mixed device, the liquefaction sand tower Feed inlet connect with washing precipitation tank, with the liquefied gas being passed through into liquefaction sand tower after washing, the liquefaction sand tower Discharge port is connect with extraneous gas separation unit, liquefied refinery gas, the top of the liquefaction sand tower and regenerative mixed device is discharged Connection.

The utility model has the beneficial effects that: oil liquefied gas, which is passed through pre-alkali cleaning device, carries out caustic prescrub to liquefied gas, The liquefied gas that hydrogen sulfide is removed after caustic prescrub is passed through level-one extraction device, level-one extraction device to the liquefied gas after caustic prescrub into The extracting of row level-one, the liquefied gas after level-one is extracted are passed through second level extraction device, and second level extraction device is to the liquid after level-one extracting Change gas and carry out second level extracting, the liquefied gas of removal of mercaptans qualification is passed through water washing device after second level is extracted, and water washing device takes out second level Liquefied gas after mentioning is washed, and the liquefied gas after washing is passed through liquefied gas dehydration dealkalization device, the liquefied gas dehydration is de- The water of liquefied gas and alkali abjection are reached liquefied gas refining desulfurization by alkali device, realize the caustic wash desulfuration of liquefied gas；Liquefaction qi exhaustion The connection of the entrance of water dealkalization device and gas separation unit, the liquid-phase outlet of gas separation unit and the catalytic distillation hydrogenation desulfurizer Entrance connects, the liquefied gas after etherification reaction, and after distilling after the first destilling tower, higher boiling sulfur compound is all rich in liquefied gas Collecting in product MTBE, sulfur-bearing MTBE removes higher boiling sulfur compound using after-fractionating column distillation in MTBE, The MTBE of low-sulfur is steamed from after-fractionating column overhead, and the MTBE for being enriched the high-sulfur of sulfur-containing compound is arranged from after-fractionating tower bottom Out, again by being delivered in catalytic distillation tower in the middle part of catalytic distillation tower, hydrogen enters the MTBE of high-sulfur from the bottom of catalytic distillation tower It in catalytic distillation tower, is reacted with hydrogen generate hydrogen sulfide under the effect of the catalyst, hydrogen sulfide and light component are distilled to catalysis and steamed Column overhead is evaporated, stripper is entered after the condensation of the first condenser, liquid a part after stripping returns stream, another part conduct Overhead product enters caustic treater, and the tail gas containing hydrogen sulfide is vented after caustic treater absorbs hydrogen sulfide, to obtain low-sulfur MTBE。

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the oil liquefied gas caustic wash desulfuration equipment.

In figure: oil liquefied gas caustic wash desulfuration equipment 10, methyltertiarvbutyl ether reactor 21, the first destilling tower 22, after-fractionating tower 23, Catalytic distillation tower 24, the first condenser 25, stripper 26, caustic treater 27, gate valve 28, reflux pump 29, the second condenser 210, extraction Take tower 211, methanol column 212, regenerator 30, pre-alkali cleaning device 41, level-one extraction device 42, second level extraction device 43, washing dress Set 44, liquefied gas dehydration dealkalization device 45, regenerative mixed device 451, gas separation unit 50, mass flowmenter 60, flow instrument 70.

Specific embodiment

It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model, for this For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others Attached drawing.

Referring to Fig. 1, the utility model embodiment provides a kind of oil liquefied gas caustic wash desulfuration equipment 10, including regenerator 30, caustic washing system, gas separation unit 50, catalytic distillation hydrogenation desulfurizer, the outlet of the regenerator 30 and caustic washing system into Mouth connection, is passed through caustic washing system for oil liquefied gas, the outlet of the caustic washing system is connect with the entrance of gas separation unit 50, institute Gas separation unit 50 is stated with a gaseous phase outlet and a liquid-phase outlet, liquid-phase outlet and the catalysis of the gas separation unit 50 Distill the entrance connection of hydrodesulfurization unit；The caustic washing system includes pre-alkali cleaning device 41, level-one extraction device 42, second level pumping Device 43, water washing device 44, liquefied gas dehydration dealkalization device 45 are mentioned, discharge port and the level-one extracting of the pre-alkali cleaning device 41 fill The feed inlet connection for setting 42, is passed through level-one extraction device 42, the level-one extraction device for the oil liquefied gas after caustic prescrub 42 discharge port is connect with the feed inlet of second level extraction device 43, and the oil liquefied gas after level-one is extracted is passed through second level extracting The discharge port of device 43, the second level extraction device 43 is connect with the feed inlet of 44 device of water washing device, after second level is extracted Oil liquefied gas be passed through water washing device 44, the charging of discharge port and liquefied gas the dehydration dealkalization device 45 of the water washing device 44 Oil liquefied gas after washing is passed through liquefied gas dehydration dealkalization device 45 by mouth connection, and the liquefied gas is dehydrated dealkalization device 45 connect with the entrance of gas separation unit 50, and the water of liquefied gas and alkali are deviate from and liquefied refinery gas is passed through gas separation unit 50；Institute Stating catalytic distillation hydrogenation desulfurizer includes methyltertiarvbutyl ether reactor 21, the first destilling tower 22, after-fractionating tower 23, catalytic distillation tower 24, the first condenser 25, stripper 26, caustic treater 27, gate valve 28, reflux pump 29, the second condenser 210, the etherification reaction The outlet of device 21 is connect with the entrance of the first destilling tower 22, and the entrance of 22 outlet at bottom of the first destilling tower and after-fractionating tower 23 connects It connects, 23 outlet at bottom of after-fractionating tower is connect with the entrance at 24 middle part of catalytic distillation tower, is additionally provided in 24 lower part of catalytic distillation tower The outlet of hydrogen inlet, the top of after-fractionating tower 23 is connect with the entrance of the first condenser 25, the outlet of the first condenser 25 and The entrance of stripper 26 connects, and the outlet at 26 top of stripper is connect with the entrance of caustic treater 27,26 outlet at bottom of stripper Gate valve 28 is installed, the entrance of the reflux pump 29 is connected to discharge pipe, and reflux pump 29 and discharge pipe connect on discharge pipe Place is met between 26 outlet at bottom of stripper and gate valve 28, the outlet of reflux pump 29 and the reflux of 24 middle and upper part of catalytic distillation tower Mouth connection, the outlet of 24 bottom of catalytic distillation tower is connect with the entrance of the second condenser 210.

Oil liquefied gas is mainly with the liquefied gas after alcohol amine removal of H2S, the liquefied gas come from hydramine method desulfurization unit Main component is C3, C4 component, contains a small amount of hydrogen sulfide and organic sulfur (mainly mercaptan, carbonyl sulfur, carbon disulfide).Liquefied gas Doctor process principle is mainly that the faintly acid of foundation mercaptan and mercaptan anion are easily oxidized and generate the two spies of disulphide Property, reaction equation are as follows: RSH+NaOH → RSNa+H2O (removes mercaptan sulfur) from oil product；2RSNa+1/2O2+H2O → RSSR+2NaOH (the removal of mercaptans anion from alkali).Mercaptan is generated by highly basic in extractant (NaOH) and thiol reaction Sodium, sodium mercaptides are dissolved in extractant, are removed from liquefied gas.

The working principle of the utility model are as follows: mix raw material liquefied gas with 10% lye in pre-alkali cleaning of evaporator, through sufficiently mixed Enter 41 sedimentation separation of caustic prescrub device after closing haptoreaction, by the hydrogen sulfide stripping in liquefied gas, periodically to hydrogen sulfide content Measurement, to determine the need for replacement lye；The coking liquefied gas of alkali cleaning qualification and solvent are sufficiently mixed through static mixer, Sedimentation separation, lye pressurized circulation uses after separation, and fresh lye interruption supplement, alkaline residue is depressed into alkaline residue tank certainly；Liquefied gas is to one Grade extraction device 42 carries out liquid-liquid extracting with the lye dissolved with catalyst, after completing level-one extractive reaction, settles into level-one Tank sedimentation separation, the extraction solvent rich in sodium mercaptides are extruded by level-one sedimentation pot bottom；Liquefied gas presses out from level-one settling tank, The regeneration lean solvent come with poor dose of pump, comes into full contact with into second order reaction static mixer, after carrying out the reaction of second level extraction desulfurization alcohol, Into second level settling tank sedimentation separation；The liquefied gas of removal of mercaptans qualification enters liquefied gas water washing device 44 at the top of second level settling tank and uses Demineralized water washing, then through 44 sedimentation separation of water washing device, the washing water of bottom is recycled after the pressurization of water washing device 44, fresh Demineralized water interruption supplement；Half lean solvent of second level sedimentation pot bottom is pumped out, is sent through the control of boundary position to first order reaction mixer Before；After removal of mercaptans liquefied gas washing after liquefied gas be sent into liquefied gas dehydration dealkalization device 45 further separate micro alkali mist, The impurity such as water.

Since a second level extractive process is all using strong mixing, so level-one settling tank and second level settling tank will have enough sink Disengaging time drops, and the sedimentation separation time is at least one hour.

The beneficial effect of utility model is: oil liquefied gas is passed through pre-alkali cleaning device 41 and carries out caustic prescrub to liquefied gas, The liquefied gas that hydrogen sulfide is removed after caustic prescrub is passed through level-one extraction device 42, level-one extraction device 42 is to the liquefaction after caustic prescrub Gas carries out level-one extracting, and the liquefied gas after level-one is extracted is passed through second level extraction device 43, and second level extraction device 43 takes out level-one Liquefied gas after mentioning carries out second level extracting, and the liquefied gas of removal of mercaptans qualification is passed through water washing device 44, washing dress after second level is extracted Liquefied gas after setting 44 pairs of second level extractings is washed, and the liquefied gas after washing is passed through liquefied gas dehydration dealkalization device 45, institute It states liquefied gas dehydration dealkalization device 45 and the water of liquefied gas and alkali abjection is reached into liquefied gas refining desulfurization, realize the alkali of liquefied gas Elute sulphur；Liquefied gas dehydration dealkalization device 45 connect with the entrance of gas separation unit 50, the liquid-phase outlet of gas separation unit 50 with it is described The entrance of catalytic distillation hydrogenation desulfurizer connects, the liquefied gas after etherification reaction, after being distilled after the first destilling tower 22, liquid Change higher boiling sulfur compound in gas to be all enriched in product MTBE, sulfur-bearing MTBE will be high using the distillation of after-fractionating tower 23 Boiling sulfides remove in MTBE, and the MTBE of low-sulfur is steamed from 23 tower top of after-fractionating tower, are enriched sulfur-containing compound The MTBE of high-sulfur is discharged from 23 bottom of after-fractionating tower, and the MTBE of high-sulfur is again by being delivered to catalytic distillation tower in the middle part of catalytic distillation tower 24 In 24, hydrogen enters in catalytic distillation tower 24 from the bottom of catalytic distillation tower 24, reacts life with hydrogen under the effect of the catalyst At hydrogen sulfide, hydrogen sulfide and light component are distilled to 24 tower top of catalytic distillation tower, enter stripping after the condensation of the first condenser 25 Tower 26, liquid a part after stripping return stream, and another part enters caustic treater 27 as overhead product, the tail containing hydrogen sulfide Gas is vented after caustic treater 27 absorbs hydrogen sulfide, to obtain the MTBE of low-sulfur.

Further, the bottom of the regenerator 30 is provided with the first air inlet, the second air inlet, bottom of chamber in regenerator 30 There are six distributor pipes for portion's setting, and the distributor pipe is uniformly distributed from left to right, and the main air blower has a main wind entrance and a master Wind outlet, the main wind outlet are connected to the first air inlet, the second air inlet, with by main air blower by the air in the external world from the One air inlet, the second air inlet are passed through in regenerator 30, the first air inlet and three, left side distributor pipe, the second air inlet and right side Three distributor pipe connections, to divide two-way uniformly to lead to the air feed of main air blower by three, left side distributor pipe, three, right side distributor pipe Enter in regenerator 30, uniformly to provide oxygen for catalyst in regenerator 30.

Further, the catalytic distillation hydrogenation desulfurizer further includes extraction tower 211, methanol column 212, the first destilling tower The outlet at 22 tops is connect with the entrance of extraction tower 211, and the outlet of 211 bottom of extraction tower is connect with the entrance of methanol column 212, institute It states and is divided into rectifying section, conversion zone, stripping section in the first destilling tower 22 from top to bottom, the outlet at 212 top of methanol column is steamed with first The methanol inlet connection of 22 conversion zone of tower is evaporated, the outlet at 212 top of methanol column is also connect with the entrance of methyltertiarvbutyl ether reactor 21.

Isobutene conversion before ether in carbon four is low, and excessive methanol cannot participate in reacting completely, causes four methanol of carbon after ether It is exceeded；The methanol recycled from methanol column 212, a part enter methyltertiarvbutyl ether reactor 21 and recycle as raw material, and another part enters The reaction was continued for isobutene before first destilling tower, 22 conversion zone and ether in carbon four, improves the isobutene conversion before ether in carbon four Rate.

Further, the catalytic distillation hydrogenation desulfurizer further includes microprocessor and the matter that connect with microprocessor Flowmeter 60, flow instrument 70 are measured, the mass flowmenter 60 is mounted on 22 outlet at bottom of the first destilling tower and after-fractionating tower 23 Entrance between pipeline on, the flow instrument 70 is mounted on the pipeline of 23 top exit of after-fractionating tower, the quality stream Meter 60 is used to control the inlet amount into after-fractionating tower 23, and flow instrument 70 is produced for real-time detection after-fractionating tower 23 Amount, produced quantity of the microprocessor according to the detection of flow instrument 70, is calculated, and calculated result is fed back to according to algorithm is prestored Mass flowmenter 60, to control 23 inlet amount of after-fractionating tower by mass flowmenter 60.

Further, it is that produced quantity is substituted into following formula to calculate that algorithm is prestored in the microprocessor, Jin Erji Add doses, D/F=A, wherein D is produced quantity, and unit is cube m/h；F is inlet amount, and unit is cube m/h；A For constant.

In the present embodiment, the relatively stable of inlet amount and produced quantity need to be only kept, after-fractionating tower 23 can be effectively reduced Heat energy consumption.

Further, the pre-alkali cleaning device 41 includes caustic prescrub settling tank, catalytic unit alkaline residue tank, caustic prescrub mixing Device, caustic prescrub Venturi tube, the feed inlet of the caustic prescrub settling tank is connect with extraneous apparatus for feeding, to settle to caustic prescrub Liquefied petroleum gas, new lye are passed through in tank, the bottom end of the caustic prescrub settling tank is connect with catalytic unit alkaline residue tank, by alkaline residue Discharge, top and caustic prescrub mixer, the caustic prescrub Venturi tube of the caustic prescrub settling tank are separately connected.

Mixed with the sodium hydrate aqueous solution of 10% (weight) of concentration with liquefied gas during liquefied gas caustic prescrub, lye and Hydro carbons in liquefied gas does not almost work, it only reacts with acid non-hydrocarbons, generates corresponding salt.These Salt is mainly dissolved in lye and removes from liquefied gas.Therefore, caustic prescrub can remove the oxygenatedchemicals in liquefied gas (such as Aphthenic acids, phenols etc.) and certain sulfur-containing compounds (such as hydrogen sulfide, low molecule mercaptan), so that the sulphur reduced in liquefied gas contains Amount.

Further, the level-one extraction device 42 includes level-one extracting settling tank, rich extractant collection device, level-one pumping Mixer is mentioned, the feed inlet of the level-one extracting settling tank is connect with the discharge port of caustic prescrub settling tank, so that level-one extracting is heavy The liquefied gas after caustic prescrub is passed through in drop tank, the bottom end of the level-one extracting settling tank is connect with rich extractant collection device, with Rich extractant is flowed into rich extractant collection device, the top of the level-one extracting settling tank is connect with level-one extracting mixer.

Further, the second level extraction device 43 includes that second level extracts settling tank, poor extractant feeding device, half poor pumping Agent pump, second level extracting mixer are mentioned, the feed inlet of the second level extracting settling tank is connect with the discharge port of level-one extracting settling tank, So as to be passed through the liquefied gas after level-one extracting in second level extracting settling tank, the feed inlet of second level extracting settling tank also with poor pumping The discharge port connection of agent feeding device is proposed, so as to be passed through poor extractant in second level extracting settling tank, the second level extracts settling tank Bottom end connect with the feed inlet of half poor extractant pump, half poor extractant is pumped into half poor extractant pump, the half poor extracting The discharge port of agent pump is connect with the feed inlet of level-one extracting settling tank, and half poor extractant is pumped into level-one extracting settling tank, institute The top for stating second level extracting settling tank is connect with second level extracting mixer.

Half poor extractant lye is sufficiently mixed through mixer and reacts (as reactor), completes laggard level-one extracting sedimentation Tank sedimentation separation, the extractant lye rich in sodium mercaptides extract sedimentation pot bottom by level-one and extrude, and liquefied gas component is pressed from top Second level of going out extracting.Poor extractant static mixer is abundant after the regeneration that liquefied gas component after level-one extracting is come with lean solvent pump It mixes and reacts (as reactor), complete laggard second level extracting settling tank sedimentation separation, liquefied gas component is extruded from top and gone Washing precipitation tank, second level extract the poor extractant lye in settling tank bottom half, level-one are sent to extract.

Further, the water washing device 44 includes washing precipitation tank, washing water injecting pump, washing Venturi tube, the water The feed inlet for washing settling tank is connect with the discharge port of second level extracting settling tank, so that after being passed through second level extracting in washing precipitation tank Liquefied gas, the feed inlet of the washing precipitation tank is also connect with washing water injecting pump, so as to water is passed through in washing precipitation tank, the water The bottom end for washing settling tank is connect with extraneous water treatment system, alkaline water, the top of the washing precipitation tank and water is discharged Wash Venturi tube connection.

Further, the liquefied gas dehydration dealkalization device 45 includes liquefaction sand tower, regenerative mixed device 451, the liquid The feed inlet for changing sand tower is connect with washing precipitation tank, with the liquefied gas being passed through after washing into liquefaction sand tower, the liquefaction The discharge port of sand tower connect with extraneous gas separation unit 50, to be discharged liquefied refinery gas, the top of the liquefaction sand tower and Regenerative mixed device 451 connects.

Sand tower is a kind of integrated water treatment equipment, and reaction in conventional water-purifying process, precipitating workshop section, In is omitted in it Flocculation, filtering and backwash process are completed in device, so that being directly condensed and being separated into possibility in filter bed.Due to several All chemical treatment steps all carry out directly in filter bed, thus sand coarse aggregate ratio tower in equipment volume than traditional chemical treatment 80% or more is saved, dosage then saves 20%~30%.Advantage more than being based on obtains extensive development and application.

Module or unit in the utility model embodiment device can be merged according to actual needs, divide and be deleted Subtract.

Above disclosures are merely preferred embodiments of the utility model, the utility model cannot be limited with this certainly Interest field, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and according to this reality The equivalent variations made by novel claim, still falls within the scope of the utility model.

Claims (7)

1. a kind of oil liquefied gas caustic wash desulfuration equipment, it is characterised in that: including regenerator, caustic washing system, gas separation unit, catalysis Hydrodesulfurization unit, the outlet of the regenerator and the inlet communication of caustic washing system are distilled, oil liquefied gas is passed through alkali cleaning System, the outlet of the caustic washing system and the entrance of gas separation unit connect, and the gas separation unit has a gaseous phase outlet and one A liquid-phase outlet, the liquid-phase outlet of the gas separation unit are connect with the entrance of the catalytic distillation hydrogenation desulfurizer；

The caustic washing system includes pre-alkali cleaning device, level-one extraction device, second level extraction device, water washing device, liquefied gas dehydration The discharge port of dealkalization device, the pre-alkali cleaning device is connect with the feed inlet of level-one extraction device, by the petroleum after caustic prescrub Liquefied gas is passed through level-one extraction device, and the discharge port of the level-one extraction device is connect with the feed inlet of second level extraction device, with Oil liquefied gas after level-one is extracted is passed through second level extraction device, the discharge port of the second level extraction device and water washing device Feed inlet connection, the oil liquefied gas after second level is extracted are passed through water washing device, the discharge port of the water washing device and liquefaction The feed inlet of qi exhaustion water dealkalization device connects, and the oil liquefied gas after washing is passed through liquefied gas dehydration dealkalization device, described Liquefied gas is dehydrated dealkalization device and the entrance of gas separation unit connects, and the water of liquefied gas and alkali are deviate from and are passed through liquefied refinery gas Gas separation unit；

The catalytic distillation hydrogenation desulfurizer include methyltertiarvbutyl ether reactor, the first destilling tower, after-fractionating tower, catalytic distillation tower, First condenser, stripper, caustic treater, gate valve, reflux pump, the second condenser, the outlet of the methyltertiarvbutyl ether reactor are steamed with first Evaporate the entrance connection of tower, the entrance of the first destilling tower outlet at bottom and after-fractionating tower connects, after-fractionating tower outlet at bottom with Entrance connection in the middle part of catalytic distillation tower, is additionally provided with hydrogen inlet, the outlet of after-fractionating top of tower in catalytic distillation tower lower part Connect with the entrance of the first condenser, the entrance of the outlet of the first condenser and stripper connects, the outlet of stripper top with The entrance of caustic treater connects, and is equipped with gate valve, the entrance of the reflux pump and discharging on the discharge pipe of stripper outlet at bottom Pipeline connection, reflux pump and discharge pipe junction between stripper outlet at bottom and gate valve, the outlet of reflux pump with urge Change the refluxing opening connection of destilling tower middle and upper part, the outlet of catalytic distillation tower bottom is connect with the entrance of the second condenser.

2. oil liquefied gas caustic wash desulfuration equipment as described in claim 1, it is characterised in that: the catalytic distillation hydrogenation desulfurization Device further includes extraction tower, methanol column, and the entrance connection of outlet and extraction tower at the top of the first destilling tower extracts going out for tower bottom Mouth is connect with the entrance of methanol column, is divided into rectifying section, conversion zone, stripping section, methanol column from top to bottom in first destilling tower The outlet at top connect with the methanol inlet of the first distillation column reaction section, and the outlet at the top of methanol column also enters with methyltertiarvbutyl ether reactor Mouth connection.

3. oil liquefied gas caustic wash desulfuration equipment as described in claim 1, it is characterised in that: the pre-alkali cleaning device includes pre- Alkali cleaning settling tank, catalytic unit alkaline residue tank, caustic prescrub mixer, caustic prescrub Venturi tube, the charging of the caustic prescrub settling tank Mouth is connect with extraneous apparatus for feeding, to be passed through liquefied petroleum gas, new lye, the caustic prescrub sedimentation into caustic prescrub settling tank The bottom end of tank is connect with catalytic unit alkaline residue tank, and alkaline residue is discharged, and the top of the caustic prescrub settling tank is mixed with caustic prescrub Device, caustic prescrub Venturi tube are separately connected.

4. oil liquefied gas caustic wash desulfuration equipment as described in claim 1, it is characterised in that: the level-one extraction device includes Level-one extracts settling tank, rich extractant collection device, level-one and extracts mixer, the feed inlet of the level-one extracting settling tank and pre- The discharge port of alkali cleaning settling tank connects, so as to the liquefied gas after caustic prescrub is passed through in level-one extracting settling tank, the level-one extracting The bottom end of settling tank is connect with rich extractant collection device, and rich extractant is flowed into rich extractant collection device, the level-one The top for extracting settling tank is connect with level-one extracting mixer.

5. oil liquefied gas caustic wash desulfuration equipment as described in claim 1, it is characterised in that: the second level extraction device includes Second level extracts settling tank, poor extractant feeding device, half poor extractant pump, second level and extracts mixer, the second level extracting sedimentation The feed inlet of tank is connect with the discharge port of level-one extracting settling tank, so as to be passed through the liquid after level-one extracting in second level extracting settling tank Change gas, the feed inlet of the second level extracting settling tank is also connect with the discharge port of poor extractant feeding device, so that second level extracts Poor extractant is passed through in settling tank, the bottom end of the second level extracting settling tank is connect with the feed inlet of half poor extractant pump, will Half poor extractant is pumped into half poor extractant pump, and the discharge port of the half poor extractant pump and the feed inlet of level-one extracting settling tank connect It connects, half poor extractant is pumped into level-one extracting settling tank, the top of the second level extracting settling tank and second level extract mixer Connection.

6. oil liquefied gas caustic wash desulfuration equipment as described in claim 1, it is characterised in that: the water washing device includes washing Settling tank, washing water injecting pump, washing Venturi tube, the discharge port of feed inlet and second level the extracting settling tank of the washing precipitation tank Connection, so as to be passed through the liquefied gas after second level extracting in washing precipitation tank, the feed inlet of the washing precipitation tank is also infused with washing Water pump connection, so as to be passed through water in washing precipitation tank, the bottom end of the washing precipitation tank is connect with extraneous water treatment system, with Alkaline water is discharged, the top of the washing precipitation tank is connect with washing Venturi tube.

7. oil liquefied gas caustic wash desulfuration equipment as described in claim 1, it is characterised in that: the liquefied gas dehydration dealkalize dress Set including liquefy sand tower, regenerative mixed device, it is described liquefaction sand tower feed inlet connect with washing precipitation tank, with to liquefy sand The discharge port of liquefied gas after being passed through washing in filter tower, the liquefaction sand tower is connect with extraneous gas separation unit, essence is discharged The top of liquefied gas processed, the liquefaction sand tower is connect with regenerative mixed device.