公开(公告)号：US4309396A

公开(公告)日：1982-01-05

申请号：US191273

申请日：1980-09-26

Applicant: Peter Herbrechtsmeier ,  Rudolf Steiner ,  Herbert Vilcsek

Inventor： Peter Herbrechtsmeier ,  Rudolf Steiner ,  Herbert Vilcsek

IPC: B01D53/18 ,  B01D53/56 ,  B01D53/77 ,  C01B21/40

CPC classification number: C01B21/40 ,  B01D53/56

Abstract: Nitric oxides can be absorbed from gas mixtures containing nitric oxides (NO and NO.sub.2) and oxygen by absorption with aqueous solutions. According to the invention, the absorption is effected in bubble columns, superficial velocities of 2 to 30 cm/second being maintained. It is advantageous to connect several bubble columns in series such that the gas and absorption liquid pass in counter-current to one another. In this embodiment, considerably less counter-current stages are required to achieve a high degree of absorption of NO.sub.x than in the case of conventional processes. At superficial velocities of 10 to 30 cm/second, large bubbles of gas can rapidly form from the gas introduced and can interact with the absorption liquid only with difficulty. In this case, gas distributor devices are incorporated in the bubble column. Since NO.sub.2 is more readily absorbed than NO, it is advantageous to connect flow reactors, in which NO.sub.2 is formed from NO and O.sub.2, upstream of the bubble columns.

Abstract translation: 一氧化氮可以通过含有硝酸氧化物（NO和NO2）的气体混合物和氧气通过水溶液吸收而吸收。 根据本发明，在气泡塔中实现吸收，保持2至30cm /秒的表观速度。 连接几个气泡塔是有利的，使得气体和吸收液体彼此逆流通过。 在该实施例中，与常规方法的情况相比，需要相当少的逆流阶段来实现高吸收NOx。 在10〜30cm /秒的表观速度下，气体可以从引入的气体迅速形成，并且难以与吸收液体相互作用。 在这种情况下，气体分配器装置结合在气泡塔中。 由于NO2比NO更容易吸收，因此连接流动反应器是有利的，其中NO 2由气泡塔上游的NO和O2形成。

公开(公告)号：US4138470A

公开(公告)日：1979-02-06

申请号：US826639

申请日：1977-08-22

Applicant: Donald W. Bolme

Inventor： Donald W. Bolme

IPC: B01D53/56 ,  C01B21/36 ,  C01B21/38 ,  C01B21/40

CPC classification number: B01D53/56 ,  C01B21/36

Abstract: Nitric oxide may be removed from gases which it is admixed by contacting the gases with aqueous solutions containing nitrate ions in sufficient concentration to oxidize the nitric oxide to nitrous acid and to retain it in the solution under stable conditions. Other oxides of nitrogen can also be absorbed producing nitrous acid which is retained in the aqueous solution in a similar manner. Thereafter, the scrubbing solution is regenerated under controlled conditions, producing a gas stream which contains the recovered nitrogen oxides in relatively high concentration and a scrubbing solution which can be recycled. The recovered nitrogen oxides may be used in the manufacture of nitric acid or other compounds or decomposed into harmless gases.

Abstract translation: 通过使气体与含有足够浓度的硝酸根离子的水溶液接触，将一氧化氮从气体中除去，从而将一氧化氮氧化成亚硝酸并将其保持在稳定条件下的溶液中。 还可以吸收其它的氮氧化物，以类似的方式产生保留在水溶液中的亚硝酸。 此后，洗涤溶液在受控条件下再生，产生含有较高浓度的回收的氮氧化物的气流和可回收的洗涤溶液。 回收的氮氧化物可用于制造硝酸或其他化合物或分解成无害气体。

公开(公告)号：US4115516A

公开(公告)日：1978-09-19

申请号：US805354

申请日：1977-06-10

Applicant: Koichi Takami ,  Shingo Abe ,  Yukio Takigawa ,  Toshinori Tsutsumi ,  Yoshio Kinsho

Inventor： Koichi Takami ,  Shingo Abe ,  Yukio Takigawa ,  Toshinori Tsutsumi ,  Yoshio Kinsho

IPC: B01D53/94 ,  B01D53/56 ,  C01B21/40 ,  B01D53/00

CPC classification number: B01D53/56

Abstract: A compressed exhaust gas containing nitrogen oxides discharged from a compressed absorption type nitric acid plant is treated by adding ammonia or an ammonia precursor to the gas and passing the gas through a NO.sub.x removing catalytic layer to an exhaust gas turbine wherein the temperature of the main flow of the exhaust gas in the zone from the point of which ammonia or an ammonia precursor is added to the outlet of the exhaust gas turbine is maintained at a temperature higher than T.degree. K = 10.sup.3 / (1.91 - 0.228 log P) [P : a sum of partial pressures of ammonia and nitrogen oxides (atm.)] and feeding an inert gas into the place of the zone in which the exhaust gas stagnates.

Abstract translation: 从压缩吸收型硝酸设备排出的含有氮氧化物的压缩废气通过向气体中加入氨或氨前体并将气体通过NOx去除催化剂层来处理到排气涡轮机，其中主流的温度 从氨水或氨前体加入到废气涡轮机出口处的废气中的废气保持在高于T°K = 103 /（1.91-0.228logP）的温度[P： 氨和氮氧化物的分压的总和（atm。）]，并将惰性气体输送到废气停滞的区域的位置。

公开(公告)号：US4064221A

公开(公告)日：1977-12-20

申请号：US720559

申请日：1976-09-07

Applicant: Luis Marzo Rodrigo ,  Jesus Marzo Rodrigo

Inventor： Luis Marzo Rodrigo ,  Jesus Marzo Rodrigo

IPC: C01B21/44 ,  C01B21/40

CPC classification number: C01B21/44

Abstract: The present invention relates to a process for obtaining nitric acid of a concentration higher than the azeotropic concentration by means of the absorption of nitrogen oxides in water or diluted nitric acid and the partial pressure of the nitrogen oxides before absorption is raised partly by compression of the gases that contain the nitrous gases and partly by means of a cycle of diluted nitric acid which is decomposed by the action of the NO contained in the gases, enriching them in NO.sub.2 and which subsequently reform by absorption of NO.sub.2 in water when the partial pressure of the nitrogen oxides is low.

Abstract translation: 本发明涉及通过在水或稀硝酸中吸收氮氧化物来获得浓度高于共沸浓度的硝酸的方法，部分地通过压缩 含有亚硝气体的气体，部分通过稀释的硝酸循环，其通过气体中所含的NO的作用而分解，将其富集在NO 2中，并随后通过在水中的NO 2吸收而改变，当分压 氮氧化物低。

公开(公告)号：US4036934A

公开(公告)日：1977-07-19

申请号：US693137

申请日：1976-06-07

Applicant: Clifford E. Selin ,  Wayne A. Proell ,  James M. Applegate

Inventor： Clifford E. Selin ,  Wayne A. Proell ,  James M. Applegate

IPC: C01B21/46 ,  C01B21/40

CPC classification number: C01B21/46

Abstract: DISCLOSED IS A TWO STAGE process AND APPARATUS for preparation of NITRIC AICD characterized by efficient use of heat liberated by the conversion of NITROGEN OXIDES TO NITRIC ACID.

Abstract translation: 被公开的是用于制备NITRIC AICD的两阶段过程和装置，其特征在于有效利用由氮氧化物转化为硝酸而释放的热量。

公开(公告)号：US4018872A

公开(公告)日：1977-04-19

申请号：US639192

申请日：1975-12-09

Applicant: Diego Barba ,  Fabrizio Battistoni ,  Candido D'Agostini ,  Giorgio Macchi

Inventor： Diego Barba ,  Fabrizio Battistoni ,  Candido D'Agostini ,  Giorgio Macchi

IPC: C01B21/26 ,  C01B21/40

CPC classification number: C01B21/26

Abstract: Nitric acid having a concentration of at least 98 wt.% is produced from nitrogen peroxide by absorbing the latter in superazeotropic nitric acid, distilling the resulting solution so as to recover nitric acid at a concentration of at least 98 wt.% and nitrogen peroxide, liquefying the latter and reacting it in a first stage with aqueous nitric acid (70-80% wt.%) and air and delivering the resulting superazeotropic nitric acid, together with the solution, to the distillation column. Nitrogen peroxide and oxygen unreacted in the first stage are contacted with nitric acid at 68-75 wt.% in a second stage, thus to produce said aqueous nitric acid fed to the second stage. The said nitric acid at 68-75 wt.% and the superazeotropic acid used for the absorption are extracted from the bottom part of the distillation column.

Abstract translation: 浓度至少为98重量％的硝酸通过在超氧阴离子硝酸中吸收后者，由氮氧化物产生，蒸馏所得溶液以回收浓度至少为98重量％的硝酸和过氧化氢， 液化后者并在第一阶段使其与硝酸水溶液（70-80重量％）和空气反应，并将所得的超声波硝酸与溶液一起输送到蒸馏塔。 第一阶段中未反应的过氧化氢和氧气在第二阶段与68-75重量％的硝酸接触，从而产生供给第二阶段的硝酸水溶液。 所述硝酸为68-75重量％，用于吸收的超级酸性酸从蒸馏塔的底部提取。

公开(公告)号：US3714333A

公开(公告)日：1973-01-30

申请号：US3714333D

申请日：1971-05-18

Applicant: SUMITOMO CHEMICAL CO

Inventor： OHRUI T ,  SAKAKIBARA Y ,  TANAKA J

IPC: C01B21/26 ,  C01B21/40

CPC classification number: C01B21/26

Abstract: A PROCESS FOR EFFICIENTLY PRODUCING CONCENTRATED NITRIC ACID WHICH COMPRISES THE STEPS OF (1) ABSORPTION OF NITROGEN PEROXIDE, (2) STRIPPING OF NITROGEN PEROXIDE, (3) SYNTHESIS OF CONCENTRATED NITRIC ACID FROM DILUTE NITRIC ACID, NITROGEN PEROXIDE AND AIR, AND (4) WASHING OF EXHAUST GAS, CHARACTERIZED IN THAT THE 80-90 WEIGHT PERCENT CONCENTRATED NITRIC ACID OBTAINED IN THE NITRIC ACID SYNTHESIS STEP IS USED AS AN ABSORBENT FOR NITROGEN PEROXIDE; NITROGEN PEROXIDE IN THE FUMING NITRIC ACID OBTAINED IN THE NITROGEN PEROXIDE ABSORPTION STEP AND THE CONCENTRATED NITRIC ACID OBTAINED IN THE NITRIC ACID SYNTHESIS STEP IS STRIPPED FROM CONCENTRATED NITRIC ACID WITH THE FEED AIR; THE STRIPPED NITROGEN PEROXIDE IS CHARGED TO THE NITRIC ACID SYNTHESIS STEP TOGETHER WITH THE FEED AIR; UNREACTED NITROGEN PEROXIDE CONTAINED IN THE EXHAUST GAS FROM THE NITRIC ACID SYNTHESIS STEP IS ABSORBED IN THE FEED DILUTE NITRIC ACID AND IS THEN RECYCLED TO THE NITRIC ACID SYNTHESIS STEP; AND UNABSORBED GAS IN THE EXHAUST GAS WASHING STEP IS RECYCLED TO THE NITROGEN PEROXIDE ABSORPTION STEP.

公开(公告)号：US3592591A

公开(公告)日：1971-07-13

申请号：US3592591D

申请日：1968-10-29

Applicant: CARRIER CORP

Inventor： MORROW DAVID R

IPC: C01B21/26 ,  F02C6/10 ,  C01B21/40

CPC classification number: F02C6/10 ,  C01B21/26

Abstract: A NITRIC ACID PRODUCING PLANT EMPLOYING A REFRIGERATION UNIT WHICH UTILIZED ENERGY GIVEN OFF BY THE CHEMICAL REACTIONS PRODUCTIVE OF NITRIC ACID TO COOL THE SUBSTANCES PRODUCED BY THE CHEMICAL REACTIONS AND TO REDUCE THE TEMPERATURE OF THE PLANT ABSORPTION TOWER TO INCREASE REACTION EFFICIENCY AND DECREASE REACTION TIME TO INCREASE PLANT EFFICIENCY.

公开(公告)号：US3489653A

公开(公告)日：1970-01-13

申请号：US3489653D

申请日：1967-05-09

Applicant: CHEM & IND CORP

Inventor： STRAWN MAX ,  ALTAMIRANO LLOYD E

IPC: C01B21/40 ,  C01B21/44

CPC classification number: C01B21/40

公开(公告)号：US20240010493A1

公开(公告)日：2024-01-11

申请号：US18038440

申请日：2022-01-18

Applicant: NITROCAPT AB

Inventor： Gustaf Forsberg ,  Peter Baeling ,  Ronnie Andersson

IPC: C01B21/20 ,  C01B21/40

CPC classification number: C01B21/203 ,  C01B21/40

Abstract: There is provided a method for the synthesis of nitrogen oxides (NOx) comprising the steps of providing a gas mixture comprising oxygen and nitrogen; and heating the gas mixture to a temperature of at least 2300 K at a pressure of 10-100 bar in a thermal reactor forming a gas mixture comprising NOx. There is also provided a method for the production of HNO3.