DE2949394A1 - Corrosion inhibiting mixt. for gas handling equipment - contg. alkali, fatty amine and unsatd. fatty acid alkanol:amide - Google Patents

Abstract

Mixt. for inhibiting metal corrosion comprises, as active ingredients, 5-30 wt.% alkaline material (I); 5-50 wt.% film- forming 10-25C amine (II) and 10-40 wt.% alkanolamide of unsatd. fatty acids (III). It can also contain 5-25 wt.% imidazoline or its derivs. and 5-25 wt.% of esters of fatty acids with higher alcohols. Pref. the compsn. is used at a rate of 1 wt.pt. per 5-50 wt. pts. solvent. The compsns. are used in equipment for recovery, storage and transport of natural gas or towns gas.

Description

description

The present invention relates to a mix inhibitor against metal corrosion for the protection of metal parts of facilities which are used for extraction, storage and are used to transport natural gas or coal gas.

Some gas components, such as carbon dioxide, hydrogen sulfide, Oxygen and organic acids, together with water, form a corrosively active one Medium that can damage metal containers, pipes, fittings and caused by other metal accessories.

The action of these components is often caused by entrained particles chemical character, for example chlorides, or mechanical character, for example Sand, reinforced. The corrosive attack can be surface, dimple or intergranular Have shape with the abrasive effect of the carried rock.

Another form of sr is corrosion as a result of material fatigue the se-named corrosion cracking.

The limitation of de orrosion of the mentioned system is very important, - Even if methods for solving the corrosion protection are known in principle. You can choose either expensive, corrosive metal materials or on the metal surface Form a fiber coating or finally clay cheaper in the case of Werwundung Apply corrosion inhibitors to metal materials.

In the @@@@@@@@@@@@ as corrosion inhibitors substances from Type the alkylphenols and the calcium salts of sulfonic acids, as well as polyesters and hydrochlorides aliphatic amines, mixtures of alkylpyridinium bases, condensation products of Pyridines with chloromethylated hydrocarbons and the like are used.

The inventive mixing inhibitor against metal corrosion contains Active ingredients containing 5 to 30% by weight of volatile alkalizing agents, for example Morpholine, cyclohexylamine, ammonia, hydrazine, 5 to 50% by weight of film-forming C10- to C25 amines, for example octadecylamine and 10 to 40% by weight alkanolamides of unsaturated Fatty acids or imidazoline and its derivatives in a concentration of 5 to 25% by weight or esters of fatty acids with higher alcohols in one concentration from 5 to 25% by weight.

There are preferably 5 to 50 parts by weight per part by weight of active ingredients Solvent, for example methanol, ethanol, hydrocarbon condensate or a mixture of these.

The mixing inhibitor according to the invention is first used for the production of luminous gas used probes. After dissolving in methanol, ethanol or in a hydrocarbon condensate the inhibitor is pumped into the recovery probe in the form of a 2 to 20% solution dosed, namely in an amount of 200 liters / l million cubic meters of the conveyed Gas. The gas production is only after 24 hours of action of the inhibitor, which forms a protective film on the metal surface. After opening of gas extraction the first week 200 liters / 1 million m³ 3 gas, the next week 50 liters / l Million m of gas and then 3 always dosed 10 liters / l million m of gas.

The invention is specifically carried out in the following examples explained in more detail.

Example 1 A mixing inhibitor against metal corrosion which contains 30% by weight Cyclohexylamine, 30% by weight octadecylamine, 40% by weight alkanolamides of unsaturated fatty acids contains, is used in the form of a 10% alcoholic solution. For laboratory tests, The mixing inhibitor showed which actual corrosion conditions were simulated a 93X inhibitory effect.

Example 2 A mixing inhibitor against metal corrosion which contains 10% by weight Morpholine, 20% by weight of octadecylamine, 20% by weight of alkanolamides of unsaturated fatty acids, 25% by weight of imidazoline derivatives (imidazole derivatives) 25% by weight of esters of fatty acids with higher alcohols.

contains, is in the form of a 5% solution in a methanol-hydrocarbon condensate mixture used in a ratio of 1: 2. In laboratory tests, the mixing inhibitor exhibited a 95% inhibitory effect.

Example 3 A mixing inhibitor against metal corrosion which contains 20% by weight Cyclohexylamine, 10% by weight octadecylamine, 40% by weight diethanolamide of the fatty acids from coconut fat, 20 wt .-% imidazole alkyl derivatives, 40 wt .-% enter of the fatty acids with Höberen @@ kohob

Claims (4)

MIXED INHIBITOR AGAINST METAL CORROSION Patent claims li mixed inhibitor against metal corrosion, noting that it is used as active ingredients 5 to 30% by weight of alkalizing agents, 5 to 50% by weight of film-forming C10 to C25 amines and contains 10 to 40% by weight alkanolamides of unsaturated fatty acids. 2. Mixing inhibitor according to claim 1, d a d u r c h g e -k e n n z e 1 c h n e t that he uses imidazoline and its derivatives in a concentration of 5 contains up to 25% by weight. 3. Mixing inhibitor according to claim 1, d a d u r c h g e -k e n n z e n e t that he also esters of fatty acids with higher alcohols in one concentration from 5 to 25 wt 4. Mixing inhibitor according to Claims 1 to 3, it is stated that he is based on 1 part by weight of active ingredients Contains 5 to 50 parts by weight of solvent.