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Method for determining effective substance content of petroleum sulfonate

A technology of petroleum sulfonate and effective substances, which is applied in the direction of chemical analysis by titration, etc., can solve the problems of difficult judgment of the reaction end point, expensive indicator, easy pollution of the environment, etc., and achieve clear end point, simple operation and repeatability Good results

Active Publication Date: 2013-11-27
PETROCHINA CO LTD
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  • Abstract
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Problems solved by technology

The indicator is expensive and not easily available in the domestic market
Moreover, chloroform is sensitive to light. It will interact with oxygen in the air when exposed to light, and gradually decompose to generate highly toxic phosgene (carbonyl chloride) and hydrogen chloride. It is easy to pollute the environment and cause poisoning, which is harmful to the human body.
In addition, when Haiming 1622 is used for titration in the prior art, the end point of the reaction is not easy to judge

Method used

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  • Method for determining effective substance content of petroleum sulfonate
  • Method for determining effective substance content of petroleum sulfonate
  • Method for determining effective substance content of petroleum sulfonate

Examples

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Embodiment 1

[0033] The present embodiment provides the method for measuring petroleum sulfonate effective matter content, and it comprises the following steps:

[0034] 1. Select sodium dodecylbenzene sulfonate with a known effective content of 90% for the test, accurately weigh 5.0000 g of sodium dodecylbenzene sulfonate, add distilled water to a volumetric flask of 100 mL for testing, Its theoretical active substance content is 4.5%.

[0035] 2. Take a 50ml glass beaker and weigh about 0.8342g (W) of the liquid to be tested.

[0036] 3. Put 0.8342g sample in a 25mL volumetric flask, add distilled water to shake up to volume, take 1mL sample with a pipette and place it in a 100mL stoppered measuring cylinder, add 5 drops of mixed indicator, 5-10 drops of Baili Phenol blue indicator and 5mL sodium sulfate acidic solution (each liter of sodium sulfate acidic solution contains 100g of Na 2 SO 4 and 12.6 mL of 98 wt% concentrated H 2 SO 4 , the balance is water), add water to keep the w...

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Abstract

The invention relates to a method for determining the effective substance content of petroleum sulfonate, which comprises the following steps: weighing 0.5-1.0g of petroleum sulfonate; putting the petroleum sulfonate in a 25mL measuring flask, shaking up, and diluting to the specified volume, thus obtaining a detection sample; putting 1mL of detection sample in a 100mL measuring cylinder with a stopper, adding 5-8 drops of mixed indicator, 5-10 drops of thymol blue indicator and 5-10mL of sodium sulfate acidic solution, adding water to keep the water phase at 30-35mL, adding 15-20mL of dichloromethane, oscillating, and shaking up to obtain a mixed sample, wherein the mixed indicator is a mixture of methylene blue and methyl orange; titrating the mixed sample with a CTMAB (cetyl trimethyl ammonium bromide) solution until the titration end point (namely the bottom phase is changed from blue to green); and calculating the concentration of the sulfonate according to the titration result. The method has the advantages of high precision, simple and quick operation process, high reliability, clear end point and less interference.

Description

technical field [0001] The invention relates to a method for measuring the effective content of petroleum sulfonate, belonging to the technical field of petroleum exploration and development. Background technique [0002] Due to the low price, high activity efficiency and low use concentration of sulfonate surfactants, it is the surfactant with the largest output and the most used in research work and field tests so far. Our country has successively carried out pilot tests of ASP flooding in Daqing, Shengli and other oil fields, and achieved good results. [0003] Petroleum sulfonate surfactant has low interfacial tension, best phase state and high solubilizing ability, and its raw materials come from a wide range of sources. Petroleum sulfonate plays an important role in tertiary oil recovery, and it is very meaningful to establish a quick and easy method suitable for determination of petroleum sulfonate content in tertiary oil recovery. At present, the commonly used meth...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 张洪君王浩郑猛张群梁凌熏张玉涛刘晶晶柳燕丽吴桂英柴君良
Owner PETROCHINA CO LTD
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