JPH06228896A - Treatment of stripping gas - Google Patents
Treatment of stripping gasInfo
- Publication number
- JPH06228896A JPH06228896A JP5017321A JP1732193A JPH06228896A JP H06228896 A JPH06228896 A JP H06228896A JP 5017321 A JP5017321 A JP 5017321A JP 1732193 A JP1732193 A JP 1732193A JP H06228896 A JPH06228896 A JP H06228896A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- stripping
- treatment
- aqueous solution
- generated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は臭気物質を含んだ水溶液
のストリッピングの処理の改良に関する。FIELD OF THE INVENTION The present invention relates to an improved stripping process for aqueous solutions containing odorous substances.
【０００２】[0002]
【従来の技術】クラフトパルプ製造の蒸解工程では、蒸
解薬液中の硫化ソ−ダ−と木材チップ中のリグニンとの
反応や硫化ソ−ダ−の加水分解により、硫化水素、メチ
ルメルカプタン、ジメチルサルファイド、及びジメチル
ジサルファイド等の臭気物質が生成する。これらの臭気
物質は、蒸解釜からパルプがブロ−される時に発生する
ブロ−ガス中に含まれる。2. Description of the Related Art In the cooking process for producing kraft pulp, hydrogen sulfide, methyl mercaptan, and dimethyl sulfide are produced by the reaction of soda sulfide in a cooking chemical liquid with lignin in wood chips and the hydrolysis of soda sulfide. , And odorous substances such as dimethyl disulfide are produced. These odorous substances are contained in the blow gas generated when the pulp is blown from the digester.
【０００３】ブロ−ガスはコンデンサ−により非凝縮性
ガスと凝縮水に分けられる。非凝縮性ガスは臭気ガスを
含んでいるため、公害対策上燃焼等の方法により脱臭さ
れている。一方凝縮水も臭気物質を含んでいるため脱臭
が必要となる。又同じく黒液濃縮工程のエバポレ−タ−
凝縮ドレンにも臭気物質を含んでいるため脱臭が必要と
なる。一般に凝縮水の脱臭にはストリッピング処理が行
われ、発生するガスは回収ボイラ−やキルンで燃焼され
ている。これらの処理を施すことで悪臭に対する公害対
策上の問題は解決できる。The blow gas is divided into a non-condensable gas and condensed water by a condenser. Since the non-condensable gas contains odorous gas, it is deodorized by a method such as combustion in order to prevent pollution. On the other hand, since condensed water also contains odorous substances, deodorization is necessary. Similarly, an evaporator for the black liquor concentration process
Deodorization is necessary because condensed drain also contains odorous substances. Generally, stripping treatment is performed for deodorizing condensed water, and the generated gas is burned in a recovery boiler or kiln. By performing these treatments, the problem of pollution control against foul odors can be solved.
【０００４】しかし、ストリッピングで発生するガスを
燃焼させることは回収ボイラ−やキルンでのＳＯｘの発
生等の公害上の問題やキルンの操業性の悪化等の諸問題
があった。更に燃焼させることはクラフトパルプ製造工
程系内のイオウの損失を生じるという問題があった。However, burning the gas generated by stripping has various problems such as pollution problems such as generation of SOx in the recovery boiler and the kiln and deterioration of operability of the kiln. Further burning has a problem of causing loss of sulfur in the kraft pulp manufacturing process system.
【０００５】[0005]
【発明が解決しようとする課題】本発明者等は、上記の
問題点を解決すべく鋭意研究を重ねた結果、ストリッピ
ング処理で発生したガスをアルカリ性水溶液で処理する
ことにより、ガス中の臭気物質が除去でき、さらに臭気
物質中のイオウ分を回収することができることを見いだ
し、この知見に基づいて本発明を完成するにいたった。
本発明の目的は、クラフトパルプ工程のブロ−ガス凝縮
水やエバポレ−タ−凝縮ドレン等のストリッピング処理
における前記の問題点を解決して、ストリッピングガス
の中の臭気物質濃度を低下させ、更にイオウ分を回収で
きるシステムを提供することである。DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, by treating the gas generated in the stripping treatment with an alkaline aqueous solution, the odor in the gas is reduced. It has been found that the substance can be removed and the sulfur content in the odorous substance can be recovered, and the present invention has been completed based on this finding.
An object of the present invention is to solve the above-mentioned problems in stripping treatment such as blow gas condensed water and evaporator-condensed drain in the kraft pulp process, and reduce the odorous substance concentration in the stripping gas, Furthermore, it is to provide a system capable of recovering sulfur content.
【０００６】[0006]
【課題を解決するための手段】本発明は、クラフトパル
プ製造工程で発生する臭気物質を含んだ水溶液をストリ
ッピングする工程において、ストリッピングから発生す
るガスをアルカリ性水溶液で処理することを特徴とする
ストリッピングガスの処理方法である。従来の基本的な
ストリッピング処理のシステムがストリッピングから発
生するガスは無処理で回収ボイラ−やキルンで燃焼する
のに対して、本発明はアルカリ性水溶液で処理した後燃
焼又は大気に放出する方法である。The present invention is characterized in that in the step of stripping an aqueous solution containing an odorous substance generated in a kraft pulp manufacturing step, the gas generated from the stripping is treated with an alkaline aqueous solution. This is a stripping gas treatment method. In the conventional basic stripping treatment system, the gas generated from the stripping is burned in the recovery boiler or kiln without treatment, whereas the present invention is a method of treating the gas with an alkaline aqueous solution and then releasing it into the atmosphere. Is.
【０００７】これを図１で説明するとブロ−ガスの凝縮
水やエバポレ−タ−の凝縮ドレン等の臭気物質を含んだ
水溶液は、ストリッピングタワ−１でストリッピングさ
れる。ストリッピング後のガスはアルカリ処理装置２に
導入されガス中の硫化水素、メチルメルカプタン、ジメ
チルサルファイド及びジメチルジサルファイド等の臭気
物質はアルカリ性水溶液中に吸収される。臭気物質を吸
収したアルカリ性水溶液は系内に回収される。To explain this with reference to FIG. 1, an aqueous solution containing odorous substances such as condensed water of blow gas and condensed drain of an evaporator is stripped by a stripping tower-1. The stripped gas is introduced into the alkali treatment apparatus 2, and odorous substances such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide and dimethyl disulfide in the gas are absorbed in the alkaline aqueous solution. The alkaline aqueous solution that has absorbed the odorous substance is recovered in the system.
【０００８】ここで用いるアルカリ性水溶液は、クラフ
トパルプ製造工程での白液、緑液ならびにそれらの酸化
物の単独又は混合物が使用可能である。更に苛性ソ−ダ
溶液、炭酸ソ−ダ溶液及びそれらの混合物が使用可能で
あり、その工場の状況に合わせて使用するアルカリ性水
溶液を決めればよい。As the alkaline aqueous solution used here, white liquor, green liquor in the kraft pulp manufacturing process and their oxides can be used alone or in a mixture. Further, a caustic soda solution, a sodium carbonate solution and a mixture thereof can be used, and the alkaline aqueous solution to be used may be determined according to the situation of the factory.
【０００９】アルカリ処理装置でストリッピング後のガ
スとアルカリ性水溶液を接触させて処理するが、接触の
方法は向流でも併流でもよい。臭気物質を吸収したアル
カリ性水溶液はそのまま系内に回収してもよく、又は図
２で示すようにアルカリ処理装置で再度使用してその一
部を系内に回収するいわゆる循環方式のどちらをとって
もよい。ガスと液量の比は、ガス中の臭気物質の量と液
のアルカリ濃度及びアルカリ処理装置の構造によって適
正な条件を選択すればよい。The stripping gas and the alkaline aqueous solution are brought into contact with each other in the alkali treatment apparatus for treatment, but the contacting method may be countercurrent or cocurrent. The alkaline aqueous solution which has absorbed the odorous substance may be recovered in the system as it is, or may be so-called a circulation system in which the alkaline solution is reused in the alkali treatment apparatus and a part thereof is recovered in the system as shown in FIG. . As for the ratio of the gas to the liquid amount, an appropriate condition may be selected depending on the amount of the odorous substance in the gas, the alkali concentration of the liquid and the structure of the alkali processing apparatus.
【００１０】[0010]
【実施例】以下本発明を実施例及び比較例によって更に
詳しく説明するが、本発明はこれらによって限定される
ものではない。EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
【００１１】実施例１ クラフト蒸解工程の蒸解釜から発生するブロ−ガスの凝
縮水を図１に示す装置を用いて表１に示す条件でストリ
ッピングし、ストリッピングで発生するガスを処理し
た。アルカリ処理装置で硫化水素、メチルメルカプタ
ン、ジメチルサルファイド、及びジメチルジサルファイ
ド等の臭気物質を吸収した白液は蒸解工程に回収した。
アルカリ処理装置前後のガス濃度及び系内に回収したイ
オウ分の結果を表２に示す。Example 1 Condensed water of blow gas generated from a digester in the kraft cooking process was stripped under the conditions shown in Table 1 by using the apparatus shown in FIG. 1, and the gas generated by stripping was treated. The white liquor which had absorbed odorous substances such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide in the alkaline treatment device was recovered in the cooking process.
Table 2 shows the gas concentrations before and after the alkali treatment device and the results of the sulfur content recovered in the system.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】表２に示した実施例の結果から本発明の方
法で処理したガスは、処理しないガス（ストリッピング
後のガス＝アルカリ処理装置前のガス）と比較してガス
中の臭気物質濃度が低く、このガスを燃焼させる回収ボ
イラ−やキルンへの影響が少くなることが分かる。又多
量のイオウ分が系内に回収されることが分かる。From the results of the examples shown in Table 2, the gas treated by the method of the present invention was compared with the gas not treated (the gas after stripping = the gas before the alkali treatment device) and the concentration of odorous substances in the gas. It is understood that the effect on the recovery boiler and kiln for burning this gas is low. It can also be seen that a large amount of sulfur is recovered in the system.
【００１５】[0015]
【発明の効果】臭気物質を含んだ凝縮水のストリッピン
グ後のガス処理で本発明の方法が優れている点は、ガス
中の臭気物質の濃度が低くなり更にイオウ分を系内に回
収できることである。The advantage of the method of the present invention in the gas treatment after the stripping of the condensed water containing the odorous substance is that the concentration of the odorous substance in the gas becomes low and the sulfur content can be further recovered in the system. Is.
【図１】本発明のストリッピングガスの処理方法の装置
を示す概略図。FIG. 1 is a schematic view showing an apparatus of a stripping gas treatment method of the present invention.
【図２】本発明のストリッピングガスの処理方法の実施
例で使用した装置を示す概略図。FIG. 2 is a schematic view showing an apparatus used in an example of a stripping gas treatment method of the present invention.
１ ストリッピングタワ− ２ アルカリ処理装置 1 Stripping tower 2 Alkaline treatment equipment
───────────────────────────────────────────────────── フロントページの続き (72)発明者 市橋 好延 東京都千代田区丸の内３丁目４番２号三菱 製紙株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinobu Ichihashi 3-4-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Paper Mills, Ltd.
Claims (1)
物質を含んだ水溶液をストリッピングする工程におい
て、ストリッピングから発生するガスをアルカリ性水溶
液で処理することを特徴とするストリッピングガスの処
理方法。1. A method for treating stripping gas, characterized in that in the step of stripping an aqueous solution containing an odorous substance generated in a kraft pulp manufacturing step, the gas generated from stripping is treated with an alkaline aqueous solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5017321A JPH06228896A (en) | 1993-02-04 | 1993-02-04 | Treatment of stripping gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5017321A JPH06228896A (en) | 1993-02-04 | 1993-02-04 | Treatment of stripping gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06228896A true JPH06228896A (en) | 1994-08-16 |
Family
ID=11940774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5017321A Pending JPH06228896A (en) | 1993-02-04 | 1993-02-04 | Treatment of stripping gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06228896A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008279385A (en) * | 2007-05-11 | 2008-11-20 | Kurita Water Ind Ltd | Anaerobic treatment method and anaerobic treatment apparatus |
| JP2011218298A (en) * | 2010-04-09 | 2011-11-04 | Ihi Corp | Anaerobic treatment facility and anaerobic treatment method |
| CN114846202A (en) * | 2019-12-20 | 2022-08-02 | 安德里兹公司 | Method for removing volatile compounds from lignin-containing material, use of a distillation method and lignin-containing material |
-
1993
- 1993-02-04 JP JP5017321A patent/JPH06228896A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008279385A (en) * | 2007-05-11 | 2008-11-20 | Kurita Water Ind Ltd | Anaerobic treatment method and anaerobic treatment apparatus |
| JP2011218298A (en) * | 2010-04-09 | 2011-11-04 | Ihi Corp | Anaerobic treatment facility and anaerobic treatment method |
| CN114846202A (en) * | 2019-12-20 | 2022-08-02 | 安德里兹公司 | Method for removing volatile compounds from lignin-containing material, use of a distillation method and lignin-containing material |
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