A kind of separation and purification process of polyphenylene sulfide

Abstract

The invention discloses a process for separating and purifying polyphenylene sulfide. The process includes (1), separating the granular polyphenylene sulfide from mixtures with the polyphenylene sulfide by centrifugal machines, and mixing the remaining mixtures and diatomaceous earth with one another in mixing kettles to obtain mixtures A; (2), connecting outlets of the mixing kettles with pumps,connecting outlets of the pumps with regulating valves, connecting the regulating valves with plate hermetic filters, conveying the mixtures A to the plate hermetic filters by the pumps and filteringthe mixtures A to obtain solid materials and filter liquor B; (3), delivering the filter liquor B into rectification systems and rectifying the filter liquor B. The process has the advantages that theself-operated regulating valves and the plate hermetic filters are used with one another, the diatomaceous earth is applied to procedures for separating and purifying the polyphenylene sulfide, accordingly, the problems of pump and rectification tower blockage due to materials, the requirement on detaching tower equipment for clearing or washing the tower equipment and material leakage can be effectively solved by the aid of the process, product loss further can be reduced, environmental pollution can be abated, and the productivity can be improved.

Description

technical field

[0001] The invention belongs to the field of polyphenylene sulfide production technology, in particular to a separation and purification process of polyphenylene sulfide. Background technique

[0002] In the prior art, the industrially produced mixture containing polyphenylene sulfide is cooled, filtered, and washed, and all the mixed liquid is put into a horizontal spiral sedimentation centrifuge for solid-liquid separation. Polyphenylene sulfide belongs to particles, and there are Part of the polyphenylene sulfide that has not grown into granules is a kind of oligomer powder of polyphenylene sulfide (the oligomer powder of polyphenylene sulfide has a lower molecular weight and lower melting point than granular polyphenylene sulfide). During the process, the oligomer powder is not easy to settle and floats in the liquid. After entering the rectification system with the mother liquor, it is easy to block the reboiler of the rectification tower, the tower inte...

Examples

Embodiment 1

[0034] A separation and purification process of polyphenylene sulfide, the specific steps are as follows:

[0035] (1) The mixture containing polyphenylene sulfide produced by 1Kg of industrial production is first separated by a centrifuge to separate granular polyphenylene sulfide, and the remaining mixture and diatomaceous earth are mixed in a mixing tank (containing a mixture of polyphenylene sulfide and diatoms) The mass ratio of soil is 100:1) fully stir and mix in the mixing tank (the time of stirring and mixing at 20-30°C is 15 minutes, the stirring speed is 16.5 rpm), and the mixture A is prepared;

[0036] (2) The outlet of the mixing kettle is connected with the pump, and the outlet of the pump is connected with the self-operated control valve, and the self-operated control valve is connected with the Ama filter, and the mixture A is transported to the Ama filter by the action of the pump, and filtered to obtain Oligomer powder and filtrate B of polyphenylene sulfide...

Embodiment 2

[0042] A separation and purification process of polyphenylene sulfide, the specific steps are as follows:

[0043] (1) The mixture containing polyphenylene sulfide produced by 1Kg of industrial production is first separated by a centrifuge to separate granular polyphenylene sulfide, and the remaining mixture and diatomaceous earth are mixed in a mixing tank (containing a mixture of polyphenylene sulfide and diatoms) The mass ratio of soil is 100:0.5) and fully stirred and mixed in the mixing tank (the stirring and mixing time is 30 minutes at 20-30°C, and the stirring speed is 10 rpm), and the mixture A is prepared;

[0044] (2) The outlet of the mixing kettle is connected with the pump, and the outlet of the pump is connected with the self-operated regulating valve, and the self-operated regulating valve is connected with the Ama filter, and the mixture A is transported to the Ama filter by the action of the pump, and filtered to obtain Oligomer powder and filtrate B of polyp...

Embodiment 3

[0050] A separation and purification process of polyphenylene sulfide, the specific steps are as follows:

[0051] (1) The mixture containing polyphenylene sulfide produced by 1Kg of industrial production is first separated by a centrifuge to separate granular polyphenylene sulfide, and the remaining mixture and diatomaceous earth are mixed in a mixing tank (containing a mixture of polyphenylene sulfide and diatoms) The mass ratio of soil is 100:2) fully stir and mix in the mixing tank (the time of stirring and mixing at 25°C is 20 minutes, the stirring speed of the mixing tank is 20 rpm), and the mixture A is prepared;

[0052] (2) The outlet of the mixing kettle is connected with the pump, and the outlet of the pump is connected with the self-operated control valve, and the self-operated control valve is connected with the Ama filter, and the mixture A is transported to the Ama filter by the action of the pump, and filtered to obtain Oligomer powder and filtrate B of polyphe...

technical field

[0001] The invention belongs to the field of polyphenylene sulfide production technology, in particular to a separation and purification process of polyphenylene sulfide. Background technique

[0002] In the prior art, the industrially produced mixture containing polyphenylene sulfide is cooled, filtered, and washed, and all the mixed liquid is put into a horizontal spiral sedimentation centrifuge for solid-liquid separation. Polyphenylene sulfide belongs to particles, and there are Part of the polyphenylene sulfide that has not grown into granules is a kind of oligomer powder of polyphenylene sulfide (the oligomer powder of polyphenylene sulfide has a lower molecular weight and lower melting point than granular polyphenylene sulfide). During the process, the oligomer powder is not easy to settle and floats in the liquid. After entering the rectification system with the mother liquor, it is easy to block the reboiler of the rectification tower, the tower inte...

Examples

Embodiment 1

[0034] A separation and purification process of polyphenylene sulfide, the specific steps are as follows:

[0035] (1) The mixture containing polyphenylene sulfide produced by 1Kg of industrial production is first separated by a centrifuge to separate granular polyphenylene sulfide, and the remaining mixture and diatomaceous earth are mixed in a mixing tank (containing a mixture of polyphenylene sulfide and diatoms) The mass ratio of soil is 100:1) fully stir and mix in the mixing tank (the time of stirring and mixing at 20-30°C is 15 minutes, the stirring speed is 16.5 rpm), and the mixture A is prepared;

[0036] (2) The outlet of the mixing kettle is connected with the pump, and the outlet of the pump is connected with the self-operated control valve, and the self-operated control valve is connected with the Ama filter, and the mixture A is transported to the Ama filter by the action of the pump, and filtered to obtain Oligomer powder and filtrate B of polyphenylene sulfide...

Embodiment 2

[0042] A separation and purification process of polyphenylene sulfide, the specific steps are as follows:

[0043] (1) The mixture containing polyphenylene sulfide produced by 1Kg of industrial production is first separated by a centrifuge to separate granular polyphenylene sulfide, and the remaining mixture and diatomaceous earth are mixed in a mixing tank (containing a mixture of polyphenylene sulfide and diatoms) The mass ratio of soil is 100:0.5) and fully stirred and mixed in the mixing tank (the stirring and mixing time is 30 minutes at 20-30°C, and the stirring speed is 10 rpm), and the mixture A is prepared;

[0044] (2) The outlet of the mixing kettle is connected with the pump, and the outlet of the pump is connected with the self-operated regulating valve, and the self-operated regulating valve is connected with the Ama filter, and the mixture A is transported to the Ama filter by the action of the pump, and filtered to obtain Oligomer powder and filtrate B of polyp...

Embodiment 3

[0050] A separation and purification process of polyphenylene sulfide, the specific steps are as follows:

[0051] (1) The mixture containing polyphenylene sulfide produced by 1Kg of industrial production is first separated by a centrifuge to separate granular polyphenylene sulfide, and the remaining mixture and diatomaceous earth are mixed in a mixing tank (containing a mixture of polyphenylene sulfide and diatoms) The mass ratio of soil is 100:2) fully stir and mix in the mixing tank (the time of stirring and mixing at 25°C is 20 minutes, the stirring speed of the mixing tank is 20 rpm), and the mixture A is prepared;

[0052] (2) The outlet of the mixing kettle is connected with the pump, and the outlet of the pump is connected with the self-operated control valve, and the self-operated control valve is connected with the Ama filter, and the mixture A is transported to the Ama filter by the action of the pump, and filtered to obtain Oligomer powder and filtrate B of polyphe...

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