Gas purification system

• US 4,375,450 A
• Filed: 04/15/1981
• Issued: 03/01/1983
• Est. Priority Date: 04/15/1981
• Status: Expired due to Fees

• Current Assignee: Osaka Gas Company Limited
• Original Assignee: Osaka Gas Company Limited
• Inventors: Katagiri, Katsuo, Shimazu, Kiyotaka
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US06/254,558
• Time in Patent Office: 685 Days
• Field of Search: 55/46-48, 55/52-54, 55/56, 55/70, 55/68, 55/71, 55/73, 55/85, 55/89, 55/196, 55/228, 423/236, 423/234, 423/238, 423/233, 423/573, 422/170, 201/28-30, 202/270
• US Class Current: 422/170
• CPC Class Codes: B01D 53/00 Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols, recovery of volatile solvents by condensation B01D5/00; sublimation B01D7/00; cold traps, cold baffles B01D8/00; working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00; cleaning coal gas C10K; working-up of natural gas, or synthetic natural gas, C10L3/10; separation of difficult-to-condense gases or air by liquefaction F25J; for investigating materials G01N30/00
• CPC Class Codes: C10G 1/002 in combination with oil conversion- or refining processes

Abstract

A gas purification system has: a first treatment apparatus, which purifies an untreated feed gas, containing toxic ingredients such as HCN gas, H₂ S gas and NH₃ gas, into a primary treated gas by causing the feed gas to contact with an alkaline absorbent liquid; an absorbent-liquid-resuscitation apparatus, which refreshes the absorbent liquid, after absorbing the toxic ingredients, by bubblingly introducing a resuscitation gas; and a second treatment apparatus, which further purifies the primary treated gas into a secondary treated gas by strippingly capturing any possible remnant NH₃ gas still present in the former. The resuscitation gas and the toxic-ingredient-absorbed absorbent liquid are forcibly converged by premix nozzles into combined gas/liquid jets as are injected into the absorbent-liquid-resuscitation apparatus. The primary treated gas and the gas coming from the resuscitation apparatus as its effluent waste are commingled and the resultant mixed gas is then fed into and treated within the second treatment apparatus.

Claims

1. A system for purifying coal carbonization product gas containing NCN gas, H₂ S gas and NH₃ gas, comprising:

first treatment means including a closed chamber which receives said coal carbonization product gas at a lower portion thereof, spray means mounted in an upper portion of said chamber to spray an alkaline absorbent liquid for contact with said coal carbonization product gas,

absorbent liquid resuscitation means including a further closed chamber connected to said first treatment means through a pump and recirculation conduit means,

nozzle means connected to said recirculation conduit means which feeds the absorbent liquid received from said first treatment means, together with an oxygen containing resuscitation gas, into said resuscitation means,

a further recirculation circuit means connected to said resuscitation means and said spray means which feeds the absorbent liquid resuscitated in said resuscitation means to said spray means, and

second treatment means connected to a top portion of said first treatment means through supply conduit means, said second treatment means being adapted to remove NH₃ gas remaining in the coal carbonization gas sent from said first treatment means,

said nozzle means is in a form of a premix nozzle including therein a resuscitation gas passage joining an absorbent liquid passage, whereby the resuscitation gas is mixed into the absorbent liquid in fine bubbles prior to entry into said resuscitation means, and

said resuscitation means is connected at a top portion to an upstream side of said second treatment means, whereby the resuscitation gas discharged from said resuscitation means is delivered to said second treatment means confluently with the coal carbonization product gas discharged from said first treatment means.

2. The system of claim 1, wherein said closed chamber of the first treatment means and said closed chamber of the resuscitation means are separate entities, and a mixer is disposed upstream of said second treatment means to mix the coal carbonation product gas discharged from said closed chamber of the first treatment means and the resuscitation gas discharged from said closed chamber of the resuscitation means.