Sampling assembly for detecting pH value of polymerization kettle

Abstract

The invention relates to a sampling assembly for detecting a pH value of a polymerization kettle. A sampling opening is disposed at an outlet of a filter; an inlet shutoff valve is connected with the sampling opening; one end of a pressure sampling device is connected with the inlet shutoff valve; the other end of the pressure sampling device is connected with an inlet of a circulation bracket; an outlet of the circulation bracket is connected with an outlet shutoff valve; one end of the circulation bracket is provided with an open flange; the other end of the circulation bracket is provided with a sensor installation opening; a pH transmitter is fixed on the circulation bracket through an installation fixing end cover of the sensor installation opening; an outlet of the outlet shutoff valve is connected with a termination tank through a reflux pipleline; one end of the pressure sampling device is provided with an installation flange; the other end of the pressure sampling device is sealed; a pressure transmitter is mounted on the pressure sampling device; the pH transmitter is connected with a pH controller; the pH controller is connected with a control valve and a flow transmitter; one end of the control valve is connected with the flow transmitter; and the other end of the control valve is communicated with the polymerization kettle. The assembly is small in maintenance amount, convenient for maintenance, low in failure rate and convenient for disassembly. A probability that a detection chamber of the sensor is blocked by polymer is greatly reduced.

Description

technical field [0001] The invention relates to a detection and sampling component for detecting the pH value of a polymerization kettle prone to stuttering. Background technique [0002] The present invention is based on the detection technology of Japan's Yokogawa pH8EFP online pH analyzer, combined with polymer characteristics, the background technology is described as follows: [0003] 1. Description of production process: [0004] In the production of acrylic fiber, the four materials of oxidizing agent, reducing agent, mixed monomer and BME are sent into the polymerization reactor, and a chemical reaction occurs at a temperature of 62°C. Can. Dilute the polymer with a concentration of 20% to 15% in the termination tank with water. In order to prevent the residual monomer of the polymer from continuing to react in the delivery pipeline and the termination tank to generate a polymer with a molecular weight of not about 52000, it is necessary to drain the polymer in the...

AI Technical Summary

Problems solved by technology

Since the sensor is installed and fixed through the flange and bolts on the tank top, it is extremely inconvenient to disassemble and check

[0011] (2) The polymer often appears thick and hard on the inner wall of the detection chamber of the termination tank and the sleeve of the sensor, which firmly fixes the sensor in the detection chamber, causing the detection sensor to fail because it cannot be pulled out for calibration The control system cannot be put into automatic operation normally, and the production is affected

Therefore, it often occurs that the polymer penetrates into the sensor bore through the thread of the glass electrode, causing a short circuit of the electrode and damaging the sensor.

The medium pressure detected by the sensor should be within 2Kg, while the line pressure cannot be controlled

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