Method for producing deuterium-depleted water, method for separating heavy water and light water, and method for producing deuterium-enriched water

A method for producing deuterium-depleted water by removing heavy water and semi-heavy water from water, comprising:

• a desorption step of maintaining air pressure around a predetermined adsorbent which has adsorbed water vapor in a range in which light water is desorbed and heavy water or semi-heavy water is not easily desorbed, and recovering the water vapor desorbed from the adsorbent.

A method for producing deuterium-depleted water by removing heavy water and semi-heavy water from water, comprising:

• at least one step of supplying water vapor to a predetermined adsorbent for adsorption;
• and
• at least one desorption step of maintaining air pressure around the adsorbent in a range in which light water is desorbed and heavy water or semi-heavy water is not easily desorbed, and recovering the water vapor desorbed from the adsorbent.

A method for producing deuterium-depleted water by removing heavy water and semi-heavy water from water, comprising:

• at least one first step of maintaining air pressure around a predetermined first adsorbent which has adsorbed water vapor in a first adsorption tank in a range in which light water is desorbed and heavy water or semi-heavy water is not easily desorbed, recovering the water vapor desorbed from the first adsorbent, and supplying the water vapor recovered in the first adsorption tank to a predetermined second adsorbent in a second adsorption tank for adsorption;
• and
• at least one second step of maintaining air pressure around the second adsorbent which has adsorbed the water vapor in the second adsorption tank in a range in which light water is desorbed and heavy water or semi-heavy water is not easily desorbed, recovering the water vapor desorbed from the second adsorbent, and supplying the water vapor recovered in the second adsorption tank to the first adsorbent in the first adsorption tank for adsorption.

A method for separating water into light water, and heavy water and semi-heavy water, comprising:

• an adsorption step of supplying water vapor to a predetermined adsorbent at pressure at which heavy water and semi-heavy water are adsorbed by the adsorbent and light water is not easily adsorbed, and causing the heavy water and the semi-heavy water to be adsorbed, wherein
• the pressure for supplying the water vapor in the adsorption step is a low pressure which is equal to or lower than a pressure having a maximum inclination of an adsorption isotherm of light water in the adsorbent.

A method for separating water into light water, and heavy water and semi-heavy water, comprising:

• maintaining air pressure around a predetermined adsorbent which has adsorbed water vapor in a range in which light water is desorbed and heavy water or semi-heavy water is not easily desorbed, and desorbing the water vapor from the adsorbent.

A method for producing deuterium-enriched water by removing light water from water, comprising:

• an adsorption step of supplying water vapor to a predetermined adsorbent at pressure at which heavy water and semi-heavy water are adsorbed by the adsorbent and light water is not easily adsorbed, causing the heavy water and the semi-heavy water to be adsorbed, and recovering the water adsorbed by the adsorbent, wherein
• the pressure for supplying the water vapor in the adsorption step is a low pressure which is equal to or lower than a pressure having a maximum inclination of an adsorption isotherm of light water in the adsorbent.

A method for producing deuterium-enriched water by removing light water from water, comprising:

• a desorption step of maintaining air pressure around a predetermined adsorbent which has adsorbed water vapor in a range in which light water is desorbed and heavy water or semi-heavy water is not easily desorbed, and desorbing the water vapor from the adsorbent;
• and then recovering the water remaining in the adsorbent.