SU434297A1

SU434297A1 - Method for measuring dispersion and index of reaction

Info

Publication number: SU434297A1
Application number: SU691369909A
Authority: SU
Inventors: Б.А. Желудов; М.А. Журавлев; А.М. Орешко; Е.Г. Михеева; Б.В. Иоффе; Л.М. Герштейн
Original assignee: Ленинградский Филиал Специального Конструкторского Бюро По Автоматизации Нефтепереработки И Нефтехимии
Priority date: 1969-10-10
Filing date: 1969-10-10
Publication date: 1982-11-30

Description

Изобретение относитс к области оптического контрол за качеством жидкик веществ, в частности нефтепродуктов , на содержание ароматических углеводородов . Контроль осуществл ют с помощью рефрактометрических измеренийThe invention relates to the field of optical quality control of liquid substances, in particular petroleum products, on the content of aromatic hydrocarbons. The control is carried out using refractometric measurements.

Известный способ определени ароматических углеводородов путем и мерени показателей преломлени дл двух длин волн видимого -спектра с последующим расчетом длителен и требует сложных расчетов.There is a known method for determining aromatic hydrocarbons by measuring refractive indices for two wavelengths of the visible spectrum, followed by a long-term calculation and requires complex calculations.

Предлагаемый способ позвол ет упростить , ускорить и автоматизировать процесс анализа благодар одновременному измерению разности показателей преломлени и разности средних дисперсий анализируемого образца и жидкого эталона с помощью дисперсионного полуавтоматического дифференциального рефрактометра.The proposed method allows to simplify, speed up and automate the analysis process by simultaneously measuring the difference between the refractive indices and the difference between the average dispersions of the analyzed sample and the liquid standard using a dispersive semi-automatic differential refractometer.

Согласно способу дифференциальную кювету заполн ют близкими по свойствам контролируемым и эталонным образцами , производ т терыостатирование и после прохождени лучей через кювету ыдел ют лучи нужной длины волны, раз дел н их на два канала с последующей регистрацией двум фазорегистрирующими устройствами, на одно из которыхAccording to the method, a differential cuvette is filled with similarly controlled and reference samples, thermostatic control is performed, and after passing the beams through the cuvette, beams of the desired wavelength are extracted, divided into two channels, followed by registration by two phase-recording devices, one of which

подают опорный сигнал, причем величина сигнала на одном фазорегистрирующем устройстве пропорциональна показателю преломлени , а на другом - дис персии .a reference signal is supplied, the signal size on one phase-registering device is proportional to the refractive index, and on the other - dispersion.

Содержание ароматических углеводородов , вес.%, определ ют по формулеThe content of aromatic hydrocarbons, wt.%, Is determined by the formula

А К-(10 Д FC - 0,1944 Л Пр), где К .- коэффициент, определ емый A K- (10 D FC - 0.1944 L Pr), where K. Is a coefficient defined by

0 свойствами эталона и измер емого продукта;0 properties of the standard and the measured product;

АРс разность средних дисперсий эталона и образца;APC is the difference between the average dispersions of the standard and the sample;

ДП(. - разность соответствующих DP (. - the difference of the corresponding

5 показателей преломлени .5 indices of refraction.

На чертеже приведена оптическа схема установки, позвол ющей реализовать предлагаемый способ.The drawing shows an optical setup diagram allowing the proposed method to be implemented.

Установка содержит щель 1, объек0 тив 2, дифференциальную кювету 3, выходной объектив 4, После прохождени через обтюратор 5 и проекционный объектив 6 световой поток делитс на два канала интерференционным зеркалом 7 5 и через светофильтры 8, 9 идет на светоприемники 10, 11.The installation contains a slit 1, an objective 2, a differential cuvette 3, an output lens 4. After passing through the obturator 5 and the projection lens 6, the light flux is divided into two channels by an interference mirror 7 5 and through light filters 8, 9 goes to the light receivers 10, 11.

Claims

1. A method for measuring dispersion and 0 index of refraction, for example, for determining aromatic hydrocarbons in gasolines, by introducing into the differential thermostatted cuvette similar in properties to controllable and exemplary substances, passing light through it and registering it (the number of deflected rays passing through the cuvette that, in order to improve the accuracy and productivity of the analysis, it is modulated by two different frequencies of declined after passing through the cell of spectral components, They were divided into two independent light beams, one of which was divided into two spectral regions, the rays of the required wavelength were inserted in each of them, directed to the corresponding photodetectors and receive electrical signals, the difference in phase angles between which is proportional to the dispersion measured by a phase meter device, the second beam simultaneously with the first one is directed to an additional optical channel, rays are collected on the third photodetector; select the desired spectral interval, and measure the other phaseometric device electrical signal, the change in phase angle relative to the reference signal with a constant phase is proportional to the difference in refractive indices, and the signal from the two phaseometric devices at the output of the counting unit receive an electric signal proportional to the concentration of aromatic hydrocarbons,. A method according to claim 1, characterized in that, in order to increase reliability, radiation with a continuous white spectrum is used and the necessary spectral intervals are selected with a half-width of up to 10 nm or more at a symmetrical position of the radiation maxima.

4 / AND