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Precipitation system and precipitation method
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An object and solution technology, applied in the field of precipitation system, can solve the problems of less precipitation, improved precipitation efficiency, and low concentration ratio of supernatant liquid
Active Publication Date: 2021-09-28
TOYOBO MC CORP
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In this case, the concentration ratio of the supernatant liquid from the RO device is low, and even if the supernatant liquid concentrated by the RO device is sent back to the precipitation device, the amount of precipitation of the target component from the return liquid is also small, and it is considered that it is not very possible to use it. Increased precipitation efficiency
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Embodiment approach 1
[0042] figure 1 It is a schematic diagram showing the precipitation system of Embodiment 1. refer to figure 1 , The precipitation system of this embodiment is a precipitation system for separating the target component with respect to a target solution in which at least one target component is dissolved in water. The precipitation system has: a reverse osmosis module 3; a precipitation device 2; a membrane separation device containing a semi-permeable membrane module 1; a first return mechanism (first return flow path) 41; a second return mechanism (second return flow path) 42.
[0043] The target solution is concentrated by the reverse osmosis module 3 (reverse osmosis process). In addition, the target solution passes through the precipitation device 2 (precipitation step), and the target component is precipitated from the target solution. In addition, the target solution is concentrated at a high concentration by a membrane separation device (membrane separation process: ...
Embodiment approach 2
[0091] The basic configuration of the precipitation system of this embodiment is the same as that of Embodiment 1. figure 1 Such a precipitation system is shown.
[0092] In this embodiment, the target solution contains concentrated components as components other than the target component. The concentrated component is a component that can be concentrated by the precipitation system (precipitation method) of this embodiment. That is, according to the precipitation system (precipitation method) of the present embodiment, it is possible to separate the target component in the target solution and to concentrate the concentrated component which is the other component in the target solution.
[0093] In the present embodiment, the target component is preferably a component that precipitates earlier than the concentrated component by cooling the target solution. In addition, it is preferable that the solubility of the target component is smaller than that of the concentrated compo...
Embodiment 1
[0119] use figure 1 In the precipitation system as shown, the precipitation of the target component (potassiumsulfate) was carried out under the following operating conditions. Also, the membrane separation device, is figure 1 Such a single-stage membrane separation device having one semipermeable membrane module 1 is shown.
[0120] Pressure of liquid supplied to RO module 3: 5MPa
[0121] Temperature of liquid supplied to RO module 3: 30°C
[0122] Reverse osmosis membrane 30 of RO module 3: hollow fiber type reverse osmosis membrane (material: cellulose triacetate)
[0123] The set temperature of the precipitation device 2: 10°C (the specified temperature in this embodiment)
[0124] Pressure of the liquid supplied to the semipermeable membrane module 1 of the membrane separation device: 6.5 MPa (first chamber), 0.1 MPa (second chamber)
[0125] Temperature of the liquid supplied to the semipermeable membrane module 1 of the membrane separation device: 40°C
[0126] ...
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Abstract
The present invention provides a precipitationsystem in which, from a designated solution in which at least one designated component is dissolved in water, the designated component is caused to precipitate. The present invention comprises: a reverse osmosis module that concentrates the designated solution; a deposition device that cools the designated solution to a stipulated temperature and causes the designated component to precipitate; a membrane separation device including a semipermeable membrane module that has a first chamber and a second chamber partitioned by a semipermeable membrane, the membrane separation device causing the designated solution to flow to each of the first chamber and the second chamber after the designated component has been deposited in the deposition device, pressurizing the designated solution in the first chamber to thereby transfer the water into the second chamber via the semipermeable membrane, and concentrating the designated solution in the first chamber and diluting the designated solution in the second chamber; a first return means for returning the designated solution concentrated by the membrane separation device to the deposition device; and a second return means for returning the designated solution diluted by the membrane separation device to the reverse osmosis module.
Description
technical field [0001] The present invention relates to a precipitationsystem and a precipitation method. Background technique [0002] Conventionally, there is known an apparatus that separates and recovers a target component in a target solution (solution to be treated). For example, there is known a system that cools a target solution to lower the solubility of the target component in water, precipitates (crystallizes) the target component in an amount exceeding the saturation concentration, and recovers it as a solid. [0003] On the other hand, an RO device using a reverse osmosis (Reverse Osmosis: RO) method is known as a device for concentrating components in a target solution. For example, for an RO module divided into two chambers by an RO membrane as a semipermeable membrane, the target solution is supplied to one side of the semipermeable membrane (two chambers) at a supply pressure higher than the osmotic pressure of the target component, thereby making only th...
Claims
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Application Information
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