公开(公告)号：US3495944A

公开(公告)日：1970-02-17

申请号：US3495944D

申请日：1967-06-28

Applicant: BECKMAN INSTRUMENTS INC

Inventor： MCGEE JOHN J ,  KELLY TOM J ,  HARMAN JOHN N

IPC: B01D53/66 ,  G01N1/34 ,  B01D53/02 ,  B01D53/30 ,  G01N29/02

CPC classification number: G01N1/405 ,  B01D53/66 ,  Y02A50/2347 ,  Y10T436/186 ,  Y10T436/25125 ,  Y10T436/255

Abstract: 1,182,734. Separating gas mixtures. BECKMAN INSTRUMENTS Inc. 14 June, 1968 [28 June, 1967], No. 28442/68. Heading B1L. [Also in Division C1 Ozone is removed from a gas stream containing sulphur dioxide and ozone by adsorbing the ozone with alkylthio mercury chloride, dialkylthio mercury alkylthio lead chloride, dialkylthio lead or a mixture thereof. The adsorbent is preferably coated on a granular support having a large surface area, and may be produced by reacting mercuric or lead chloride with a mercaptan, preferably ethyl mercaptan. Hydrogen sulphide and/or mercaptans may also be removed from the gas stream by adsorbing them with mercuric lead chloride, preferably coated on a granular support. The invention is applicable to removing impurities from a sulphur dioxide stream before it passes through an SO 2 analyser. The gas is passed through a scrubber 12 containing the adsorbents on the granular support (e.g. PTFE), which may be provided with a heater 20 to maintain the temperature at about 40‹C.

公开(公告)号：US3652227A

公开(公告)日：1972-03-28

申请号：US3652227D

申请日：1969-12-15

Applicant: BECKMAN INSTRUMENTS INC

Inventor： HARMAN JOHN N ,  NETI RADHAKRISHNA M

IPC: G01N31/00 ,  B01D53/34 ,  C01B21/46 ,  G01N31/10

CPC classification number: G01N31/002 ,  Y10T436/179228

Abstract: Method and apparatus for determining the nitric oxide content of a sample gas stream. The nitric oxide in the gas stream is reacted with an excess amount of ozone so as to completely convert the nitric oxide into nitrogen dioxide. The resulting gas containing nitrogen dioxide and residual ozone is passed through a scrubber which removes the ozone and does not affect the nitrogen dioxide content of the gas. The resulting gas is then analyzed for its NO2 content, which is a function of the nitric oxide content of the sample gas. The method and apparatus may also be utilized for determining the total amount of nitrogen dioxide and nitric oxide in a sample gas. The invention is particularly applicable to the monitoring of air for air pollution control.

Abstract translation: 用于确定样品气流的一氧化氮含量的方法和装置。 气流中的一氧化氮与过量的臭氧反应，以将一氧化氮完全转化为二氧化氮。 所产生的含有二氧化氮和残余臭氧的气体通过洗涤器，其除去臭氧并且不影响气体的二氧化氮含量。 然后分析所得气体的NO 2含量，其是样品气体的一氧化氮含量的函数。 该方法和装置也可用于确定样品气体中二氧化氮和一氧化氮的总量。 本发明特别适用于空气污染控制的空气监测。

公开(公告)号：US3438875A

公开(公告)日：1969-04-15

申请号：US3438875D

申请日：1966-04-14

Applicant: BECKMAN INSTRUMENTS INC

Inventor： WATANABE HIDEO ,  HARMAN JOHN N

IPC: G01N27/30 ,  C23B11/00

CPC classification number: G01N27/301

公开(公告)号：US3677708A

公开(公告)日：1972-07-18

申请号：US3677708D

申请日：1969-12-15

Applicant: BECKMAN INSTRUMENTS INC

Inventor： HARMAN JOHN N ,  NETI RADHAKRISHNA M

IPC: G01N1/34 ,  B01J11/06 ,  G01N31/06 ,  G01N31/10

CPC classification number: G01N1/405 ,  Y10T436/178459

Abstract: METHOD AND APPARTUS FOR DETERMINING NO2 IN A SAMPLE GAS STREAM CONTAINING INTERFERENTS UTILIZING A SCRUBBER AND AN ANALYTICAL INSTRUMENT WHICH IS SENSITIVE BOTH TO NO2 AND THE INTERFERENTS. THE SCRUBBER CONTAINS ARGENTIC OXIDE (AGO) WHICH EFFECTIVELY REMOVES BOTH POSITIVE AND NEGATIVE INTERENTS FROM THE SAMPLE GAS STREAM, BUT DOES NOT AFFECT THE NO2 CONTENT OF THE STREAM. THE INVENTION IS PARTICULARLY APPLICABLE TO THE MONITORING OF THE NO2 CONTENT OF POLLUTED AIR.