JPH0593287A - Corrosion inhibitor for metal - Google Patents

Corrosion inhibitor for metal

Info

Publication number
JPH0593287A
JPH0593287A JP25394591A JP25394591A JPH0593287A JP H0593287 A JPH0593287 A JP H0593287A JP 25394591 A JP25394591 A JP 25394591A JP 25394591 A JP25394591 A JP 25394591A JP H0593287 A JPH0593287 A JP H0593287A
Authority
JP
Japan
Prior art keywords
corrosion
corrosion inhibitor
water
inhibitor
condensed water
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.)
Granted
Application number
JP25394591A
Other languages
Japanese (ja)
Other versions
JP2809532B2 (en
Inventor
Norihiko Onishi
則彦 大西
Seiji Tanizaki
青磁 谷崎
Sunao Abe
直 阿部
Yukitoki Matsui
幸祝 松居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAKUTOU KK
Hakuto Co Ltd
Original Assignee
HAKUTOU KK
Hakuto Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HAKUTOU KK, Hakuto Co Ltd filed Critical HAKUTOU KK
Priority to JP3253945A priority Critical patent/JP2809532B2/en
Publication of JPH0593287A publication Critical patent/JPH0593287A/en
Application granted granted Critical
Publication of JP2809532B2 publication Critical patent/JP2809532B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/02Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/14Nitrogen-containing compounds
    • C23F11/141Amines; Quaternary ammonium compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Anti-Oxidant Or Stabilizer Compositions (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

PURPOSE:To produce the corrosion inhibitor for inhibiting the corrosion of the metal surface in the hydrocarbon distillation tower and steam condensation part by preparing the inhibitor contg. the amines shown by a specified formula as the effective component. CONSTITUTION:A corrosion inhibitor for metal contg. at least one kind of the amine (N,N-dimethylethyleneamine, N,N-dimethylethylenediamine) shown by the formula (n is an integer of 1 to 6, m is an integer of 2n or 2n-2, and R<1> and R<2> are independently 1-4C alkyls) as the effective component is prepared. The inhibitor is injected into the initial condensation part or its upstream side so that the condensed water is kept substantially at >=pH 4 in the hydrocarbon distillation tower. The corrosion problem of the condensation part is solved in this way.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、金属の腐食抑制剤に関
するものである。更に詳しくは、酸性物質を含む炭化水
素類蒸留塔の水蒸気凝縮部の金属表面で生ずる腐食を抑
制する腐食抑制剤に関するものである。
FIELD OF THE INVENTION The present invention relates to a metal corrosion inhibitor. More specifically, the present invention relates to a corrosion inhibitor that suppresses corrosion that occurs on the metal surface of the steam condensation section of a hydrocarbon distillation column containing an acidic substance.

【0002】[0002]

【従来の技術】石油精製/化学プラントにおいて炭化水
素類を蒸留して、該炭化水素類を分離、精製しようとす
る場合、炭化水素類中に含まれる水蒸気が凝縮すると、
そこに該炭化水素類中に存在していた酸性物質が溶解
し、凝縮水のpHを低下させ、該部分の装置金属面に激
しい腐食を生ずる。特に水分の初期凝縮部分にその腐食
が激しいことはよく知られていることである。
2. Description of the Related Art When distilling hydrocarbons in a petroleum refining / chemical plant to separate and refine the hydrocarbons, when steam contained in the hydrocarbons is condensed,
The acidic substances existing in the hydrocarbons are dissolved therein, and the pH of the condensed water is lowered, resulting in severe corrosion on the metal surface of the apparatus in this portion. It is well known that corrosion is particularly severe in the initial condensed portion of water.

【0003】この種の腐食を抑制するために凝縮水のp
Hを上昇させる目的で、アンモニア、モルフォリン、エ
チレンジアミン、シクロヘキシルアミン、メトキシプロ
ピルアミン等の塩基性物質を添加することはよく知られ
ている。[例えば、腐食防食協会編 “金属防蝕技術便
覧”735頁(1981年 日刊工業新聞)石油学会編
“新石油事典”736頁(1982年 朝倉書店)、特
公昭52−3896号公報、USP3,447,891
明細書等に記載されている]。
In order to suppress this kind of corrosion, the condensed water p
It is well known to add basic substances such as ammonia, morpholine, ethylenediamine, cyclohexylamine and methoxypropylamine for the purpose of increasing H. [For example, "Corrosion and Anticorrosion Society", "Handbook of Metal Corrosion Technology", page 735 (1981, Nikkan Kogyo Shimbun), Japan Petroleum Institute, "New Petroleum Encyclopedia," page 736 (1982, Asakura Shoten), JP-B-52-3896, USP 3,447. 891
It is described in the description etc.].

【0004】[0004]

【発明が解決しようとする課題】しかしながら、石油精
製/化学プラントではプラントの運転条件等の変化に伴
って、従来の腐食抑制剤では、十分な腐食抑制効果が得
られなくなる場合が生じてきた。この代表的な例として
石油精製プラントにおける原油の常圧蒸留装置が挙げら
れる。そこでは近年石油中間留分増産の要請から塔頂温
度を従来より低く保つ傾向にあり、当然の帰結として初
期凝縮部の温度は従来より低くなってきた。その結果、
この部分に従来みられなかった激しい腐食問題が生じる
ようになったが、効果的な腐食抑制方法が確立されてい
るとは言い難い。
However, in the petroleum refining / chemical plants, there have been cases where conventional corrosion inhibitors cannot provide sufficient corrosion inhibiting effect due to changes in operating conditions of the plant. A typical example of this is an atmospheric distillation unit for crude oil in an oil refinery plant. In recent years, there has been a tendency to keep the overhead temperature lower than before due to the demand for increased production of petroleum middle distillates, and as a natural consequence, the temperature of the initial condensation section has become lower than before. as a result,
Although a severe corrosion problem that has not been seen before has occurred in this part, it is hard to say that an effective corrosion suppression method has been established.

【0005】[0005]

【課題を解決するための手段】本発明は、上記の問題を
解決するために、鋭意検討を重ねた結果、到達したもの
であり、その構成するところは、一般式 (式中、nは1〜6の整数、mは2nあるいは2n−2
の整数であり、R1,R2はそれぞれ独立に炭素数1〜4
のアルキル基である)で示される1分子中に1級アミノ
基と3級アミノ基を同時に有するアミン類、および/又
は前記の一般式(I)で示されるアミン類を有効成分と
して含む金属腐食抑制剤である。前記の一般式(I)に
示される具体的な化合物としては、N,N−ジメチルエ
チレンジアミン、N,N−ジエチルエチレンジアミン、
N,N−ジメチル−1,3−プロピレンジアミン、1−
(N,N−ジエチルアミノ)−2−アミノプロパン、
N,N−ジブチル−エチレンジアミン、N,N−ジメチ
ル−1,4−シクロヘキサンジアミン等を挙げることが
できる。
Means for Solving the Problems The present invention has been achieved as a result of intensive studies to solve the above problems. (In the formula, n is an integer of 1 to 6, m is 2n or 2n-2.
And R 1 and R 2 each independently have 1 to 4 carbon atoms.
Which is an alkyl group of) and which has at the same time a primary amino group and a tertiary amino group in one molecule, and / or an amine represented by the general formula (I) as an active ingredient. It is an inhibitor. Specific compounds represented by the general formula (I) include N, N-dimethylethylenediamine, N, N-diethylethylenediamine,
N, N-dimethyl-1,3-propylenediamine, 1-
(N, N-diethylamino) -2-aminopropane,
Examples thereof include N, N-dibutyl-ethylenediamine and N, N-dimethyl-1,4-cyclohexanediamine.

【0006】本発明に挙げた腐食抑制剤は、前記の一般
式(I)で示される化合物を一種、或いは二種以上を混
合し、更に必要に応じ水あるいは適当な有機溶剤に溶解
させて使用することが出来る。さらに必要に応じ、アン
モニア、モルフォリン、エチレンジアミン、シクロヘキ
シルアミン、メトキシプロピルアミン等従来から知られ
ているアミン類と併用/混合して使用してもよい。ま
た、被膜性腐食防止剤とを併用することも何ら制限を加
えるものではない。
The corrosion inhibitor described in the present invention is used by mixing one or more of the compounds represented by the general formula (I), and further dissolving them in water or a suitable organic solvent, if necessary. You can do it. Further, if necessary, they may be used in combination with or mixed with conventionally known amines such as ammonia, morpholine, ethylenediamine, cyclohexylamine, and methoxypropylamine. Further, the combined use with the film-forming corrosion inhibitor does not impose any limitation.

【0007】本発明の腐食抑制剤の注入は、初期凝縮
部、あるいはその対象とする腐食問題個所より上流で、
かつ腐食問題個所に近い場所が望ましい。
The injection of the corrosion inhibitor of the present invention is carried out upstream of the initial condensation part or the target corrosion problem point,
And it is desirable to have a place near the corrosion problem.

【0008】一般に腐食抑制剤は、プロセス内に注入さ
れると直ちにその周囲に存在する酸性物質(主として塩
酸)と反応し中和塩(塩酸塩)となる。水蒸気が凝縮す
る個所より上流部では、この中和塩は固体、あるいは液
状で存在するが、水蒸気が凝縮するとそこに生じた水分
と中和塩が共存することになる。水蒸気の極く初期凝縮
部分では、凝縮水が少ない為に中和塩に微量の水を含ん
だ状態になるので、微量の水を含んだ中和塩の腐食性が
問題となる。水の凝縮が多くなると、中和塩が非常に高
濃度に凝縮水に溶け込むことになる。すると、そこでは
温度が高いために中和塩の一部は水中で解離し、生じた
塩酸は水中に残るが、遊離したアミンの一部は気相に移
り中和のバランスが崩れ、凝縮水のpHは下がることと
なる。これが水蒸気凝縮部分、特に初期凝縮部分に発生
する腐食の原因である。従って、腐食抑制剤として用い
るアミンは、遊離の状態で出来るだけ蒸留水に留まり、
気相に移り難いものが望ましいことになる。何れにして
も、凝縮部においては、中和塩は形成、溶解、解離を繰
り返しており、中和塩の安定性、挙動が腐食に大きく影
響することとなる。一方、プロセス中の凝縮水は、温
度、凝縮量など場所により状況がことなるが、どの場所
でもpHを一定に保つことが望ましく、pHの変動は腐
食抑制剤の過剰注入、或いは注入不足、ひいては腐食の
発生を招くこととなる。プロセス管理の側からみるとp
Hを一定に保ち易いということは重要な要素である。
Generally, the corrosion inhibitor reacts with an acidic substance (mainly hydrochloric acid) existing around the corrosion inhibitor immediately after being injected into the process to form a neutralization salt (hydrochloride). The neutralized salt exists as a solid or in a liquid state at the upstream of the point where the steam condenses, but when the steam condenses, the water generated and the neutralized salt coexist. Since the amount of condensed water is small in a very initial condensed portion of water vapor, the neutralized salt contains a small amount of water, so that the corrosiveness of the neutralized salt containing a small amount of water becomes a problem. When the water is highly condensed, the neutralized salt dissolves in the condensed water in a very high concentration. Then, because of the high temperature there, part of the neutralized salt dissociates in water, and the hydrochloric acid produced remains in the water, but part of the free amine moves to the gas phase and the balance of neutralization is disrupted, causing condensation of condensed water. Will decrease the pH. This is the cause of corrosion occurring in the steam condensation part, especially in the initial condensation part. Therefore, the amine used as a corrosion inhibitor stays in distilled water as much as possible in the free state,
Those that are difficult to move to the gas phase are desirable. In any case, in the condensing part, the neutralized salt is repeatedly formed, dissolved and dissociated, and the stability and behavior of the neutralized salt greatly affect the corrosion. On the other hand, the condensed water during the process varies depending on the location such as temperature and amount of condensation, but it is desirable to keep the pH constant at any location. This will cause corrosion. P from the process management side
It is an important factor that it is easy to keep H constant.

【0009】本発明による腐食抑制剤は、かかる問題点
を解決することを目的としたものである。すなわち、本
発明の有効成分である前記の一般式(I)のアミン類と
プロセス中の酸性物質との中和塩(主として塩酸塩)
は、微量の水を含んだ温度の高い状態で、その腐食性に
ついて大幅な改良がなされた。中和塩の腐食性につい
て、本発明に挙げた前記の一般式(I)の物質に塩酸が
付加した塩酸塩は、従来からこの目的の為に使用されて
いたアンモニア、エチレンジアミン、シクロヘキシルア
ミン、トリエチルアミン、メトキシプロピルアミン等の
塩酸塩より腐食性が低いという特長を有している。
The corrosion inhibitor according to the present invention is intended to solve such problems. That is, a neutralization salt (mainly a hydrochloride salt) of the amine of the general formula (I), which is the active ingredient of the present invention, and an acidic substance in the process.
Was significantly improved in its corrosiveness at a high temperature containing a small amount of water. Regarding the corrosiveness of the neutralized salt, the hydrochloride obtained by adding hydrochloric acid to the above-mentioned substances of the general formula (I) mentioned in the present invention is ammonia, ethylenediamine, cyclohexylamine, triethylamine which has been conventionally used for this purpose. It has the feature of being less corrosive than hydrochlorides such as methoxypropylamine.

【0010】また、本発明に挙げた腐食抑制剤は、凝縮
水への移行性に優れ、且つ、高温で水に溶解した場合で
も塩酸塩の解離によるpH低下も起こさない。これは、
水中で解離して生じた遊離アミンが気相に移り難いため
である。したがって、従来からこの目的の為に使用され
ていたアンモニア、モルフォリン、シクロヘキシルアミ
ン、トリエチルアミン等よりも遥かに優れた腐食抑制効
果を示すことが出来る。
Further, the corrosion inhibitor described in the present invention has excellent transferability to condensed water, and does not cause a pH decrease due to dissociation of the hydrochloride even when dissolved in water at high temperature. this is,
This is because the free amine generated by dissociation in water is difficult to transfer to the gas phase. Therefore, it is possible to exhibit a far superior corrosion inhibiting effect to ammonia, morpholine, cyclohexylamine, triethylamine, etc., which have been conventionally used for this purpose.

【0011】さらに本発明よる腐食抑制剤は、pH調節
機能に優れ、最終pHの設定値として一般に使われる実
質的に4以上、とくに腐食を抑制する上で望ましい5.
5から6.5の間に保つことが容易である。
Furthermore, the corrosion inhibitor according to the present invention has an excellent pH adjusting function, and is substantially 4 or more, which is generally used as a set value of the final pH, and is particularly desirable for suppressing corrosion.
It is easy to keep between 5 and 6.5.

【0012】このように本発明による前記の一般式
(I)で示される1分子中に1級アミノ基と3級アミノ
基を同時に有するアミン類は、炭化水素類蒸留塔におい
て水蒸気の初期凝縮部等に発生する腐食を抑制する上に
要求される諸点を満足させ、効果的に腐食を抑制できる
ことが認められた。
As described above, the amines represented by the above general formula (I) according to the present invention, which simultaneously have a primary amino group and a tertiary amino group in one molecule, can be used as an initial condensation part of steam in a hydrocarbon distillation column. It was found that the various points required for suppressing the corrosion occurring in the above can be satisfied and the corrosion can be effectively suppressed.

【0013】[0013]

【実施例】以下に実施例を挙げて本発明を説明する。し
かし、以下の実例中の実験例、使用例によって本発明が
制限されるものではない。
EXAMPLES The present invention will be described below with reference to examples. However, the present invention is not limited by the experimental examples and use examples in the following examples.

【0014】(実施例1)図1に示すような実験蒸留塔
2を組み、腐食抑制剤の評価を行った。この装置は、ナ
フサ、水および塩酸を蒸気にし、そこに腐食抑制剤を添
加して後徐々に凝縮させ、温度、凝縮水量、凝縮水のp
H、および腐食速度を測定するようにしたもので、実機
の初期凝縮とよい相関性をもっている。
Example 1 An experimental distillation column 2 as shown in FIG. 1 was assembled to evaluate a corrosion inhibitor. This device vaporizes naphtha, water and hydrochloric acid, adds a corrosion inhibitor to the vapor, and then gradually condenses the temperature, the amount of condensed water, and the p of condensed water.
It measures H and corrosion rate, and has a good correlation with the initial condensation of the actual equipment.

【0015】ナフサ加熱炉1を125〜140℃に設定
し、ここにナフサを1.7l/hr.づつ連続的に注入
し、蒸発させた。一方、水蒸気発生装置3には蒸留水を
0.2l/hr.づつ管7より供給し水蒸気を発生さ
せ、管8より塩酸を加えてナフサの蒸気と混合させ、凝
縮管4に送り込んだ。混合された蒸気が凝縮管4に入っ
てすぐのところで管9より腐食抑制剤を注入したが、こ
のとき、凝縮水の受け器部に取り付けたpH測定器5で
pHを6.5に保つよう腐食抑制剤の注入量をコントロ
ールした。凝縮管4は全長1.2mあり、105℃から
80℃に徐々に冷却されるようになっており、途中4ケ
所に腐食度測定用のテストピース12を取り付けた。テ
ストピース12は、材質は軟鋼であり、25×15×2
mmの大きさである。
The naphtha heating furnace 1 was set at 125 to 140 ° C., and naphtha was added thereto at 1.7 l / hr. One after the other was poured continuously and evaporated. On the other hand, in the steam generator 3, 0.2 l / hr. Then, it was supplied from a pipe 7 to generate water vapor, and hydrochloric acid was added from a pipe 8 to mix it with the vapor of naphtha, and sent to the condensing pipe 4. Immediately after the mixed vapor entered the condensing pipe 4, the corrosion inhibitor was injected from the pipe 9, but at this time, the pH measuring device 5 attached to the receiver of the condensed water should keep the pH at 6.5. The amount of corrosion inhibitor injected was controlled. The condensing tube 4 has a total length of 1.2 m and is designed to be gradually cooled from 105 ° C. to 80 ° C. The test pieces 12 for measuring the corrosion degree were attached at four places on the way. The test piece 12 is made of mild steel and has a size of 25 × 15 × 2.
The size is mm.

【0016】各腐食抑制剤について、48時間づつ同じ
条件で実験を繰り返し表1の結果を得た。腐食速度は、
テストピースの腐食減量より計算したものであり、MD
Dは、1dm2の表面積について1日あたりの腐食減量
をmgで表したものである。
For each corrosion inhibitor, the experiment was repeated for 48 hours under the same conditions, and the results shown in Table 1 were obtained. The corrosion rate is
Calculated from the corrosion weight loss of the test piece, MD
D is the corrosion weight loss per day expressed in mg for a surface area of 1 dm 2 .

【表1】 [Table 1]

【0017】水分凝縮率0.1%以下は、中和塩(塩酸
塩)に微量の水分が含まれた状態にあり、ここでの腐食
速度は、中和塩(塩酸塩)の腐食性に由来する。一方、
10%、25%水分凝縮率での腐食速度は、中和塩(塩
酸塩)が凝縮水に溶解した後、解離し水中の塩酸が多く
なって腐食をおこさせているものである。また、各部の
pHからpHの変動の大小が読み取れる。実施例のアミ
ンでは比較例に挙げたどのアミン類より優れていること
が分かる。
When the water condensation rate is 0.1% or less, a small amount of water is contained in the neutralizing salt (hydrochloric acid salt), and the corrosion rate here depends on the corrosiveness of the neutralizing salt (hydrochloric acid salt). Comes from. on the other hand,
The corrosion rate at a water condensation rate of 10% and 25% is that after the neutralization salt (hydrochloride) is dissolved in the condensed water, it is dissociated and the hydrochloric acid in the water is increased to cause corrosion. In addition, the magnitude of the pH fluctuation can be read from the pH of each part. It can be seen that the amines of the examples are superior to any of the amines listed in the comparative examples.

【0018】(実施例2)実施例1の実験において、凝
縮水のpHを6.5にコントロールすべく腐食抑制剤を
注入したが、腐食抑制剤のアミンによっては、pHを所
定の6.5に保つことが難しく、かなりpH変動した。
表2には、この実験において5分毎にpHを読み、その
変動の大きさを標準偏差の値で比較した結果を示す。
(Example 2) In the experiment of Example 1, a corrosion inhibitor was injected to control the pH of the condensed water to 6.5. However, depending on the amine of the corrosion inhibitor, the pH may be 6.5. It was difficult to keep the pH value constant and the pH fluctuated considerably.
Table 2 shows the results of reading the pH every 5 minutes in this experiment and comparing the magnitude of the variation with the value of the standard deviation.

【表2】 [Table 2]

【0019】実施例に示したアミン類は所定のpHのコ
ントロールされ、且つその変動が少ないことが分かる。
It can be seen that the amines shown in the examples have a predetermined pH controlled and little fluctuation.

【0020】(実施例3)石油精製における常圧蒸留塔
(11万バーレル/日)で、本発明によるN,N−ジメ
チルエチレンジアミンを用いて、凝縮水の最終pHが
6.5になるように注入量を調節しつつ連続運転を一年
間おこなったところ、その塔頂部、初期凝縮部の腐食が
大幅に軽減され、中和塩の堆積等の問題も全く生じなか
った。
Example 3 N, N-dimethylethylenediamine according to the present invention was used in an atmospheric distillation column (110,000 barrels / day) for petroleum refining so that the final pH of the condensed water was 6.5. When the continuous operation was carried out for one year while adjusting the injection amount, the corrosion at the top of the column and the initial condensation part was significantly reduced, and there was no problem such as accumulation of neutralized salt.

【0021】[0021]

【発明の効果】以上説明したように、本発明による腐食
抑制剤は、同様の目的に使用されている従来の中和性腐
食抑制剤に比べ、初期凝縮部の腐食が大幅に軽減され、
中和塩の堆積もなく、また凝縮水のpHコントロールも
安定して実施でき、石油精製/化学プラントにおける炭
化水素蒸留塔の水蒸気凝縮部の腐食問題を解決すること
ができる。
As described above, the corrosion inhibitor according to the present invention significantly reduces the corrosion of the initial condensation part as compared with the conventional neutralizing corrosion inhibitor used for the same purpose.
The neutralization salt is not deposited, and the pH of the condensed water can be stably controlled, so that the corrosion problem of the steam condensation section of the hydrocarbon distillation column in the petroleum refining / chemical plant can be solved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の方法を評価するための実験蒸留塔を示
す系統図である。
FIG. 1 is a system diagram showing an experimental distillation column for evaluating the method of the present invention.

【符号の説明】[Explanation of symbols]

1:ナフサ加熱炉 7:蒸留水供給管 2:蒸留塔 8:塩酸供給管 3:水蒸気発生装置 9:腐食抑制剤供給管 4:凝縮管 10:凝縮油取り出し 5:凝縮水pH測定器 11:凝縮水取り出し 6:ナフサ供給管 12:テストピース 1: Naphtha heating furnace 7: Distilled water supply pipe 2: Distillation tower 8: Hydrochloric acid supply pipe 3: Steam generator 9: Corrosion inhibitor supply pipe 4: Condensation pipe 10: Condensed oil removal 5: Condensed water pH meter 11: Condensed water removal 6: Naphtha supply pipe 12: Test piece

───────────────────────────────────────────────────── フロントページの続き (72)発明者 松居 幸祝 三重県四日市市別名六丁目6番地の9 伯 東株式会社四日市研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Matsui 9 Yokkaichi, Mie Prefecture, 6th place, 6-chome 6 Hakka East Co., Ltd. Yokkaichi Laboratory

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】一般式 (式中、nは1〜6の整数、mは2nあるいは2n−2
の整数であり、R1,R2はそれぞれ独立に炭素数1〜4
のアルキル基である)で表わされるアミン類の少なくと
も1種を有効成分として含有することを特徴とする金属
の腐食抑制剤。
1. A general formula (In the formula, n is an integer of 1 to 6, m is 2n or 2n-2.
And R 1 and R 2 each independently have 1 to 4 carbon atoms.
Which is an alkyl group of 1) is contained as an active ingredient at least one kind of amines.
【請求項2】炭化水素類蒸留塔に於いて水蒸気の凝縮水
のpHを実質的に4以上に保つように請求項1記載の腐
食抑制剤を初期凝縮部、あるいはそれより上流部に注入
することを特徴とする金属の腐食抑制方法。
2. The corrosion inhibitor according to claim 1 is injected into the initial condensation part or upstream thereof so that the pH of the condensed water of steam in the hydrocarbon distillation column is maintained at substantially 4 or more. A method for inhibiting metal corrosion, which is characterized in that
JP3253945A 1991-10-01 1991-10-01 Metal corrosion inhibitor Expired - Lifetime JP2809532B2 (en)

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JP2809532B2 JP2809532B2 (en) 1998-10-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112345437A (en) * 2020-10-28 2021-02-09 中国石油化工股份有限公司 Method and device for evaluating corrosion inhibitor on atmospheric tower top of atmospheric and vacuum distillation unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5278729A (en) * 1975-12-26 1977-07-02 Kurita Water Ind Ltd Anticorrosive for metal
JPS593724A (en) * 1982-06-29 1984-01-10 Matsushita Electric Ind Co Ltd Magnetic recording medium
EP0351099A1 (en) * 1988-07-11 1990-01-17 Betz Europe, Inc. Corrosion control composition and method for boiler/condensate aqueous systems
JPH03101801A (en) * 1989-09-14 1991-04-26 Kurita Water Ind Ltd Method for preventing corrosion of crude oil topper
JPH03150380A (en) * 1989-11-02 1991-06-26 Kurita Water Ind Ltd Neutralizing agent for petroleum oil refining and petrochemical process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5278729A (en) * 1975-12-26 1977-07-02 Kurita Water Ind Ltd Anticorrosive for metal
JPS593724A (en) * 1982-06-29 1984-01-10 Matsushita Electric Ind Co Ltd Magnetic recording medium
EP0351099A1 (en) * 1988-07-11 1990-01-17 Betz Europe, Inc. Corrosion control composition and method for boiler/condensate aqueous systems
JPH03101801A (en) * 1989-09-14 1991-04-26 Kurita Water Ind Ltd Method for preventing corrosion of crude oil topper
JPH03150380A (en) * 1989-11-02 1991-06-26 Kurita Water Ind Ltd Neutralizing agent for petroleum oil refining and petrochemical process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112345437A (en) * 2020-10-28 2021-02-09 中国石油化工股份有限公司 Method and device for evaluating corrosion inhibitor on atmospheric tower top of atmospheric and vacuum distillation unit

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