# US 8,784,648 B2 · Method for producing vacuum in a vacuum oil-stock distillation column and a plant for carrying out the method

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- Number: US 8,784,648 B2
- Document ID: US8784648B2
- Status: Granted
- Kind: B2
- Application number: 13/142,078
- Filed: 2009-06-24
- Published: 2011-10-20
- Granted: 2014-07-22
- Earliest claimed: 2008-12-25
- Applicants: Valery Grigorievich Tsegelsky
- Inventors: Valery Grigorievich Tsegelsky
- Web page: https://patentgrep.com/patent/US8784648B2

## CPC

- B01D 3/10: Vacuum distillation (B01D3/12 takes precedence)
- B01D 3/143: {by two or more of a fractionation, separation or rectification step}
- C10G 7/04: Dewatering
- C10G 7/06: Vacuum distillation
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES

## Abstract

A method is provided for producing vacuum in a vacuum oil-stock distillation column and includes pumping a gas-vapor medium out of a column by an ejector into a condenser; feeding a gas mixture and a high-pressure gas into a second gas-gas ejector from which the vapor-gas mixture is fed into a second condenser. A condensate is directed from the condensers into a separator in which the condensate is separated into a water-containing condensate and a hydrocarbon-containing condensate. The hydrocarbon-containing condensate is removed while the water-containing condensate is fed into a steam generator in which heat is supplied to the water-containing condensate from a hot distillate removed from the vacuum column and steam is produced from the water-containing condensate, the steam is fed as a high-pressure gas into the gas-gas ejectors. A plant for carrying out the method is also provided.

## Claims

### Claim 1

A method for producing vacuum in a vacuum oil-stock distillation column, said method comprising:
pumping a gas-vapor medium out of the vacuum column by a gas-gas ejector by feeding a high-pressure gas thereto with generation of a gas-vapor mixture at an outlet of the gas-gas ejector with a pressure higher than that of the gas-vapor medium at an inlet of the gas-gas ejector;
feeding the gas-vapor mixture into a condenser followed by cooling thereof and generating a gas mixture and a vapor phase condensate;
feeding the gas mixture and the high-pressure gas into a second gas-gas ejector with generation a gas-vapor mixture at an outlet thereof with a pressure higher than that of the gas mixture at an inlet of the second gas-gas ejector;
feeding the gas-vapor mixture from the second gas-gas ejector into a second condenser followed by cooling thereof and generating a gas mixture and a vapor phase condensate at an outlet of the second condenser; and
discharging the gas mixture out of the second condenser for a designated purpose, said method further comprising directing the vapor phase condensate generated in the condenser and in the second condenser into a separator where the vapor phase condensate is separated into a water-containing condensate and a hydrocarbon-containing condensate;
discharging the hydrocarbon-containing condensate out of the separator for a designated purpose while feeding said water-containing condensate by a pump into a steam generator where heat from a hot distillate discharged out of the vacuum oil-stock distillation column or an oil refining column is supplied to the water-containing condensate and obtaining a steam from said water-containing condensate, and
feeding said steam as a high-pressure gas into the gas-gas ejector and the second gas-gas ejector from the steam generator.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising generating the steam in the steam generator at a pressure within a range of 0.2 to 0.6 MPa.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising discharging a water-containing condensate portion, which was not evaporated in the steam generator, into the separator.

### Claim 4 (depends on 3)

The method according to claim 3, further comprising cooling the water-containing condensate portion, which was not evaporated in the steam generator, in a heat exchanger before it enters the separator.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising additionally feeding the steam from the steam generator into the vacuum oil-stock distillation column and/or into oil stock before it enters the vacuum column.

### Claim 6 (depends on 5)

The method according to claim 5, further comprising feeding the steam from the steam generator into the vacuum oil-stock distillation column via an additional gas-gas ejector and further pumping, by the latter, the gas-vapor medium out of the vacuum oil-stock distillation column.

### Claim 7 (depends on 1)

The method according to claim 1, further comprising feeding the steam produced in the steam generator to a furnace, additional heating of this steam in the furnace using heat of hot gases and feeding said steam from the furnace into the gas-gas ejector, and into the second gas-gas ejector and/or the vacuum oil-stock distillation column.

### Claim 8 (depends on 1)

The method according to claim 1, further comprising compressing the gas mixture from the second condenser prior to feeding said mixture for a designated purpose.

### Claim 9 (depends on 8)

The method according to claim 8, further comprising compressing the gas mixture from the second condenser in a liquid ring pump prior to feeding said mixture for the designated purpose.

### Claim 10 (depends on 8)

The method according to claim 8, further comprising compressing the gas mixture from the second condenser in a liquid-gas ejector prior to feeding said mixture for the designated purpose.

### Claim 11

A plant for producing vacuum in a vacuum oil-stock distillation column, said plant comprising:
a pipeline for evacuating a gas-vapor medium out of the vacuum oil-stock distillation column;
a gas-gas ejector, at a low-pressure gas inlet thereof to the pipeline for evacuating the gas-vapor medium from the vacuum oil-stock distillation column and connected, at a gas-vapor mixture outlet thereof, to an inlet of a condenser,
the condenser having a condensate outlet and a gas mixture outlet connected to a low-pressure gas inlet of a second gas-gas ejector,
the second gas-gas ejector connected, at a gas-vapor mixture outlet thereof to an inlet of a second condenser,
the second condenser having a condensate outlet and a gas mixture outlet, said plant further comprising:
a pipeline for supplying an oil refining distillate or oil-stock distillate;
a pipeline for evacuating the oil refining distillate or oil-stock distillate from the plant;
a separator having:
an inlet connected to the condensate outlet of the condenser,
an inlet connected to the condensate outlet of the second condenser,
a hydrocarbon-containing condensate outlet connected to a pipeline for evacuation of a hydrocarbon-containing condensate from the plant, and
a water-containing condensate outlet connected to an inlet of a pump;
the pump having an outlet connected to a water-containing condensate inlet of a steam generator,
the steam generator having:
a steam outlet connected to a high-pressure gas inlet of the gas-gas ejector and to a high-pressure gas inlet of the second gas-gas ejector,
a heating heat-transfer agent inlet connected to the pipeline for supplying the oil refining distillate or oilstock distillate, and
a heating heat-transfer agent outlet connected to the pipeline for evacuating the oil refining distillate or oil-stock distillate from the plant.

### Claim 12 (depends on 11)

The plant according to claim 11, wherein the steam generator has a non-evaporated condensate outlet, which is connected to the separator.

### Claim 13 (depends on 12)

The plant according to claim 12, wherein the non-evaporated condensate outlet of the steam generator is connected via a heat exchanger to a non-evaporated condensate inlet of the separator.

### Claim 14 (depends on 11)

The plant according to claim 11, wherein the steam outlet of the steam generator is additionally connected to the vacuum oil-stock distillation column and/or to the pipeline for supplying oil-stock to this vacuum column.

### Claim 15 (depends on 11)

The plant according to claim 11, wherein an additional gas-gas ejector connected, at a low-pressure gas inlet thereof to the pipeline for evacuating gas-vapor medium from the vacuum oil-stock distillation column, and is connected, at a steam inlet thereof to the steam outlet of the steam generator and is connected at a gas-vapor mixture outlet thereof to the vacuum column.

### Claim 16 (depends on 11)

The plant according to claim 11, wherein the condenser consists of a vapor condensation apparatus and a phase separator, wherein an inlet of the vapor condensation apparatus is connected to the gas-vapor mixture outlet of the gas-gas ejector, a two-phase mixture outlet of the vapor condensation apparatus is connected to an inlet of the phase separator having a condensate outlet and a gas mixture outlet.

### Claim 17 (depends on 11)

The plant according to claim 11, wherein the gas mixture outlet of the second condenser is connected to a gas mixture inlet of a liquid ring pump.

### Claim 18 (depends on 11)

The plant according to claim 11, wherein the gas mixture outlet of the second condenser is connected to a gas mixture inlet of a gas-liquid ejector.

### Claim 19 (depends on 11)

The plant according to claim 11 wherein the steam outlet of the steam generator is connected to the high-pressure gas inlet of the gas-gas ejector and to the high-pressure inlet of the second gas-gas ejector and/or to the vacuum oil-stock distillation column via heat exchanging pipes for heating gas in a furnace.