Desulphiting
II.2.1.13 Desulphiting
Definition :
Operation designed to remove from the must, completely or partially, the sulphur dioxide that had been introduced by sulphiting.
Objectives :
a) To render the must suitable for the production of different products, notably concentrated must, grape juice and special wines.
concentration of must by cold
II.2.1.12.4 Concentration of must by cold
Definition:
Process consisting in concentrating must by partial freezing and elimination of the ice thus formed.
Objective:
See II.2.1.12 a and c ‘Partial dehydratation of musts’
Prescriptions:
A light sulfiting of the must before freezing is recommended.
partial evaporation under atmospheric pressure
II.2.1.12.3 Partial evaporation under atmospheric pressure
Definition:
Process consisting in eliminating a certain quantity of water from grape must in an evaporational system under atmospheric pressure.
Objectives:
See II.2.1.12. b, c, and d ‘Partial dehydratation of musts’
Prescriptions:
partial evaporation under vacuum
II.2.1.12.2 Partial evaporation
Definition:
Prescriptions to concentrate musts at a moderate temperature by evaporation of a portion of the water in the thermal exchanger under a high vacuum.
Objective:
See the sheet on II.2.1.12 “Partial dehydration of musts”.
Concentration of must by reverse osmosis
II.2.1.12.1 Concentration
Definition :
Process consisting of concentrating must by elimination of part of the water through specific membranes under the action of a pressure greater than the osmotic pressure of the must.
Objective :
To obtain an enrichment of the must, especially in sugars.
Partial dehydratation of musts
II.2.1.12 Partial dehydratation of musts
Definition:
Process consisting in the elimination of a certain quantity of water in grape must.
Objectives:
a) To increase the sugar level of a must intended to be fermented;
Filtration on a filter bed
II.2.1.11.1 Filtration on a filter bed
Classification:
- Diatomite: processing aid
- Perlite : processing aid
Definition :
Filtration of the must through a bed of auxiliary filter material.
Objective :
Filtration
II.2.1.11 Filtration
Definition :
Physical process by which must is passed through appropriate filters that retain particles in suspension.
Objective :
Clarification of the must.
Prescriptions :
a) Filtration is practised with or without additives.
Treatment with silicon dioxide
II.2.1.10 Treatment with silicon dioxide
Classification
- Colloidal solution of silicon dioxide: Processing aid
Definition :
Addition to must of a colloidal solution of silicon dioxide coupled with the addition of a gelatin solution.
Objective :
Treatment with carbon
II.2.1.9 Treatment with carbon
Classification:
- Oenological carbon: processing aid
Definition :
Addition of carbon to musts.
Objectives :