Palatine process begins to fuse at:
6th week of fertilization
8th week of fertilization
10th week of fertilization
12th week of fertilization
7 weeks - palate consists of the primary palate, formed by the fusion of the medial nasal processes. Behind the primary palate down growth of the nasal septum produces two communications between  the oral and nasal cavities the primitive nasal choanae.
8 weeks - Formation of the secondary palate begins with downward growth of the medial parts of the maxillary processes (palatine processes) to a location on either side of the tongue.
As the mandible develops and the tongue drops down these palatine processes grow horizontally fusing with the nasal septum in the midline and with the primary palate along their anterior aspect. By 81/2 weeks - the palatal shelves appear above the tongue and in near contact with each other. At 8th & 9th week they come in contact and fusion begins
Key Concept -
Formation of the secondary palate begins at 8th week with downward growth of the medial parts of  the maxillary processes (palatine processes) to a location on either side of the tongue.