US2206490A - Recovery of acetylene - Google Patents

Recovery of acetylene Download PDF

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Publication number
US2206490A
US2206490A US190674A US19067438A US2206490A US 2206490 A US2206490 A US 2206490A US 190674 A US190674 A US 190674A US 19067438 A US19067438 A US 19067438A US 2206490 A US2206490 A US 2206490A
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Prior art keywords
acetylene
gas
pressure
water
washing
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Expired - Lifetime
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US190674A
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English (en)
Inventor
Tramm Heinrich
Kolling Helmut
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Ruhrchemie AG
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Ruhrchemie AG
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids

Definitions

  • Our invention relates to the recovery of acetylene from gas mixtures containing same and more particularly from gas mixtures which contain other highly unsaturated compounds in addition to acetylene,
  • acetylene can be extracted from gas mixtures containing same by means of water in a particularly satisfactory manner as follows: The gas mixture is washed first with a small quantity (preliminary treatment) and subsequently 'with a considerably larger quantity (main treatment) of water, these two washing treatments being carried out at normal .temperatures and under pressures ranging between 10 and atmospheres above normal. Acetylene is expelled from the solution obtained in the main treatment by exposing this solution at normal temperature to reduced pressure of not less than 30 mms. mercury column. Under these conditions the acetylene is washed out and. recovered with particular efllcacy.
  • the liquor may be relieved from the pressure of 10-15 atmospheres in two stages, first to about -is thereupon-freed from the dissolved acetylene at a reduced pressure of not less than mms. mercury column in a vacuum vessel into which the liquor is introduced preferably through fine nozzles.
  • the acetylene thus obtained is compressed in the vacuum pump to normal pressure. 15 In this way a gas is obtained which, after having been freed from CO2, contains up to, but not more than, 98.5% C2H 2.
  • a gas is required containing more than 99% acetylene.
  • gases of such high degree of purity can be obtained by relieving from pressure in two or more stages the concentrated aqueous solution of acetylene obtained in the main washingtreatment mentioned above and introducing 2 into the lower part of at least one of thepreliminary stages of pressure-relief part of the pure acetylene, which is obtained as the end product of the process after reduction of the pressure to about 30 mms. mercury column and after re- .moval of'the carbon dioxide and recompression in the vacuum pump.
  • the particular advantage offered by our process consists in the fact that the gas which has been compressed in the vacuum pump and freed from the carbon dioxide, contains a very high percentage of acetylene and not more than about 2% of gases which are more diflicultly soluble than Cal-I2.
  • almost pure acetylene is used in our process as washing-out agent and for this reason only a small quantity of this gas is required to be passed through the liquor while it is relieved from pressure in a preliminary stage. We succeed in thus obtaining acetylene o1 more'than 99%.
  • the gas mixture has the composition Per cent CO: 2.2 Call: 11.2 mm. 0.3 m 78.6 CH4 5.1 N 2.8
  • diacetylene a small quantity-of diacetylene and similar highly unsaturated compounds, which are designated in the above schedule as CnHm and will hereafter be termed diacetylene.
  • the diacetylene compounds amount to about 3% of the total quantity of the acetylene present.
  • This starting gas is compressed in the com- .pressor A to 10 atmospheres above normal and thereafter enters the sump of the washing column B provided with 10 to 15 trays.
  • the gas is irrigated in countercurrent with water placed, in the pump S, under a pressure of 10 atmospheres above normal. If 100 cbm. (normal) of the starting gas containing about 11% CzHa are treated, approximately 3 cbm. will be sufllcient in view of a 70% capacity of the washing column for completely washing out the diacetylene.
  • the washed gas leaves the column at C, while the water charged with acetylene, diacetylene and small quantities of the inert gases contained in the starting gas is withdrawn from the bottom of the column at D. This water con-' tains the whole of the diacetylene present, amounting to about 0.33 cbm. and about 2.4 cbm.
  • the liquor is relieved from pressure at E and is freed from the dissolved acetylene in a second washing column F.
  • the acetylene expelled escapes from the washing column at H together with the inert gases introduced into the column and is returned to the compressor A through pipe J.
  • the gas enters the: apparatus from below, under a pressure of 10 atmospheres above normal. It is irrigated with water in countercurrent and leaves the apparatus K at L free from acetylene.
  • the water which leaves the main washing apparatus K contains for instance, under a pressure of 10 atmospheres'above normal, the following gases:
  • This liquor is relieved from pressure, for instance to one atmosphere absolute, and is fed to the top of the washing column M, while acetylene, obtained as end product in the last stage of pres sure-relief and recompressed by pump P, is passed in countercurrent from below through the liquor in column M. It is important that during this treatment theliquor is thoroughly mixed .with the compressed gaseous acetylene.
  • the liquor while being relieved from pressure in this preliminary stage, is contacted intensively and for a suflicient period of time with the acetylene which in the first stage possesses a purity of about 98% and in the later stages a purity of more than 99% and is preferably compressed to substantially that pressure to which the liquor had previously been relieved.
  • the intensive contacting required may for instance be secured by the use of means which enlarge the contact surface, such as Raschig rings.
  • the acetylene forming the end product of our process is the purer, the greater the quantity of gaseous acetylene led through the liquor at this stage of the process.
  • the expelled gas leaves the degasifier N at 0. About 22-23 cbm. (normal) of a mixture of gas and vapor escape per hour, consisting of about 10.5 cbm. (normal) CzHz, 2.9 cbm., CO2 and 10 ohm. steam.
  • the main portion of the vapor is condensed in the vacuum pump P, into which the gases are led.
  • the gas which leaves the .vacuum pump and which consists of acetylene and carbon dioxide and a small quantity of moisture, is subsequently subjected to some washing treatment by which the carbon dioxide is separated from the gas mixture, whereby acetylens of high purity is recovered.
  • the water havingsbeen freed from gas in the tower N is led into a vessel .Q and is subsequently recompressed in the pump R to 10 atmospheres, whereupon it may be employed anew for the extraction of acetylene inthe main washing column K.
  • the acetylene forming the end product is the purer, the larger the quantity of compressed acetylene with which the liquor is treated while being relieved from pressure in the preliminary stage.
  • the end gas contained for instance 98.'7% CzHz, while acetylene of 99.5% was obtained by treating the same quantity of water with 27 litres per hour of the gas recovered in the second stageof pressure relief.
  • These 20 litres of gas corresponded to about 19% of the pure acetylene obtained per hour, while the 27 litres corresponded to about 26% acetylene and other highly unsaturated com-- .T.
  • pounds which comprises the steps of washing such gas mixture, at normal temperature and under a p essure ranging between about 10 and 15 atmos heres, with a small quantity of water sufiicient for practically completely extracting the highly unsaturated compounds other than acetylene, treating the washed gas at normal temperatures and under a pressure ranging between about 10 and 15 atmospheres with a quantity of water sufiicient for extracting substantial-- ly the whole of the acetylene present, relieving the aqueous solution thus obtained from pressure at normal temperature in several stages up to a reduced pressure of not less than 30 mms.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Extraction Or Liquid Replacement (AREA)
US190674A 1937-02-20 1938-02-15 Recovery of acetylene Expired - Lifetime US2206490A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE511848X 1937-02-20

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US2206490A true US2206490A (en) 1940-07-02

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US190674A Expired - Lifetime US2206490A (en) 1937-02-20 1938-02-15 Recovery of acetylene

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US (1) US2206490A (en)van)
BE (1) BE426153A (en)van)
FR (1) FR833042A (en)van)
GB (1) GB511848A (en)van)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447834A (en) * 1944-04-15 1948-08-24 Air Reduction Concentration of chlorine
US2773560A (en) * 1953-05-18 1956-12-11 Fluor Corp Separation of acetylene compounds

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447834A (en) * 1944-04-15 1948-08-24 Air Reduction Concentration of chlorine
US2773560A (en) * 1953-05-18 1956-12-11 Fluor Corp Separation of acetylene compounds

Also Published As

Publication number Publication date
GB511848A (en) 1939-08-25
BE426153A (en)van)
FR833042A (fr) 1938-10-10

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